CN108133918B - Micro-groove group radiator - Google Patents
Micro-groove group radiator Download PDFInfo
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- CN108133918B CN108133918B CN201810143996.XA CN201810143996A CN108133918B CN 108133918 B CN108133918 B CN 108133918B CN 201810143996 A CN201810143996 A CN 201810143996A CN 108133918 B CN108133918 B CN 108133918B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/427—Cooling by change of state, e.g. use of heat pipes
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The present disclosure provides a micro-groove group radiator, comprising a micro-nano composite structure surface heat sink heating surface and a radiating surface, wherein a hydrophilic nano coating is arranged on the micro-nano composite structure surface heat sink; the heat-taking surface and the heat-radiating surface enclose a closed cavity, the closed cavity contains liquid working medium, and a high-voltage electric field is applied to the surface heat sink of the micro-nano composite structure in the cavity to form an EHD effect. The ultra-high surface energy of the hydrophilic nano coating on the micro-nano composite structure surface of the micro-groove group radiator strengthens the surface energy and roughness of the liquid working medium in the micro-groove channel, improves the surface wetting characteristic, exerts a directional traction effect on the liquid working medium by an electric field effect, increases the mass flow of the liquid working medium, ensures that the heat sink continuously generates high-strength composite phase change heat exchange, and strengthens the heat exchange capacity of the radiator.
Description
Technical Field
The disclosure belongs to the field of enhanced heat exchange and electronic cooling, and in particular relates to a micro-groove group radiator.
Background
With the high-speed development of microelectronics and microelectromechanical systems, the integration level and performance of chips are continuously improved, so that the electronic equipment tends to be high-power and miniaturized. Therefore, the heating value of the device is also greatly increased, and if the heat cannot be timely discharged, the stability and the reliability of the device and the system are seriously reduced, and even the system is crashed. Heat dissipation is therefore a critical bottleneck in the design and manufacture of high power density power electronics. When the heat flux density exceeds 150W/cm < 2 >, the critical heat flux density of the conventional size surface for pool boiling phase change heat exchange is exceeded, the heat exchange process is called super heat exchange.
The micro-groove group composite phase change heat exchange technology is widely applied to high-power electronic equipment by the characteristics of high heat exchange coefficient, stable work and the like, and utilizes a composite phase change heat exchange mechanism of high-strength evaporation of an evaporation thin liquid film region near a three-phase contact line at an expansion meniscus formed by capillary force of a liquid working medium in a micro-groove and nuclear boiling of a thick liquid film region at an inherent meniscus to realize high-strength heat exchange capability, thereby being a novel high-performance microscale phase change heat exchange technology. However, under the condition of ultra-high heat flux density, the liquid working medium in the micro-groove group is dried up from top to bottom along with the continuous increase of the heat flux density of the heat source, if the drying continuously occurs, the liquid working medium cannot be timely supplemented, high-strength evaporation on an expansion meniscus cannot occur, high-strength composite phase change heat exchange cannot be performed, and the heat exchange capability of the basic heat sink of the micro-groove group is greatly deteriorated. Therefore, the wetting length on the extended meniscus that can be achieved when the liquid working medium flows along the micro-grooves becomes critical to limit the heat transfer capability of the micro-groove group.
The micro-groove group composite phase change heat exchange technology and the technical device combined with the micro-groove group composite phase change heat exchange technology provided for the technical defects existing in the existing air cooling or liquid cooling heat exchange technology have certain effects on solving the heat dissipation problem of high-power electronic devices or systems, but have no obvious results. When the device receives larger and larger power and the heat flux density is higher and higher, the liquid working medium in the micro-groove is easy to dry up too early, so that the heat transfer is deteriorated. When the power of the heat source is larger, the heating power is larger, the heat flux density applied to the heating surface of the micro-groove group is larger, the liquid on the expansion meniscus in the micro-groove is heated and evaporated, the liquid film is gradually thinned, the flow resistance is increased, the wetting length is reduced, and the heat radiation capability is reduced.
Disclosure of Invention
First, the technical problem to be solved
The present disclosure provides a micro-groove group radiator to at least partially solve the above-mentioned technical problems.
(II) technical scheme
The present disclosure provides a micro-groove group radiator, comprising: a heat extraction surface connected to a heat source by a thermally conductive material, comprising: a micro-groove group heat sink; the nano coating is generated on the surface of the micro-groove group heat sink and forms a micro-nano composite structure surface heat sink with the micro-groove group heat sink; the heat radiating surface and the heat collecting surface enclose a closed cavity, and the closed cavity contains liquid working medium; the electrode is arranged in the closed cavity, is connected with a high-voltage power supply and is used for applying an electric field to the liquid working medium on the heat sink on the surface of the micro-nano composite structure; after the heat source emits heat, the heat-collecting surface receives and transmits the heat generated by the heat source, the closed cavity generates high-intensity evaporation and boiling composite phase change heat exchange, and the emitted heat is emitted to the external environment through a plurality of heat-radiating fins connected with the radiator.
In some embodiments of the present disclosure, two ends of the closed cavity are provided with electrode outlets, wherein an electrode at one end is connected with an outlet terminal into a whole, and an electric wire is led out and connected with a high-voltage power supply at the upper end of the closed cavity, the electrode outlet terminal is fixed outside the closed cavity through an electrode pad and a compression nut, and a wire electrode at the other end is led out and grounded after being connected through a lower electrode outlet terminal, an electrode pad and a compression nut of the cavity.
In some embodiments of the present disclosure, the electrode is a wire electrode, a mesh electrode, a plate electrode, or a needle electrode.
In some embodiments of the present disclosure, the wire electrode has a radius of 0.001-1 mm, a length of 1-500 mm, and an axial perpendicular distance from the micro-groove group heat sink of 0.1-100 mm; the length and width of the mesh electrode are 1-100 mm, the thickness is 0.5-10 mm, the equivalent diameter of the mesh electrode is 0.0001-1 mm, and the axial vertical distance between the mesh electrode and the micro-groove group heat sink is 0.1-100 mm; the length and width of the plate electrode are 1-100 mm, the thickness is 0.5-10 mm, and the vertical spacing between the anode and the cathode of the plate electrode is 10-100 mm; the radius of curvature of the needle-shaped electrode tip is 0.01-1 mm, and the vertical distance between the needle-shaped electrode tip and the axial direction of the micro-groove group is 0.1-100 mm.
In some embodiments of the present disclosure, the voltage of the high voltage power supply is 1 to 50kV.
In some embodiments of the present disclosure, the liquid working medium of the micro-groove group heat sink of the wire electrode and the mesh electrode is an insulating working medium; the liquid working medium of the micro-groove group heat sink of the flat plate electrode and the needle electrode is an insulating working medium or a conductive working medium; the insulating working medium is FC72, R113, R123, R141 or n-pentane; the conductive working medium is distilled water or ethanol.
In some embodiments of the present disclosure, the nanocoating is a nanoscale planar structure or nanoscale protrusions; the material of the nano coating is metal, metal oxide, metal fluoride, semiconductor material or organic high polymer coating; the thickness of the nano coating is 0-1000 nm.
In some embodiments of the present disclosure, the surface structure of the micro-channel group heat sink is a micro-channel array structure, a nano-channel array structure, or a micro-nano composite channel array structure; the cross section of the micro channel group heat sink is rectangular, triangular or trapezoidal, and the equivalent diameter is 10- 3 -1000 mu m; the micro-groove group heat sink is made of metal, metal oxide, metal nitride, semiconductor material, glass or ceramic.
In some embodiments of the present disclosure, the cross-section of the closed cavity is rectangular, square, triangular or fan-shaped; the closed cavity is an air cavity or a vacuum cavity.
In some embodiments of the present disclosure, the micro-nano composite structure surface heat sink has an included angle of 0 ° to 180 ° with the horizontal direction.
(III) beneficial effects
According to the technical scheme, the micro-groove group radiator has at least one of the following beneficial effects:
(1) The super high surface energy of the hydrophilic nano coating on the surface of the micro-nano composite structure strengthens the surface energy and roughness of the liquid working medium in the micro-channel, improves the surface wetting characteristic, so that the heat sink continuously generates high-strength composite phase change heat exchange, and strengthens the heat exchange capacity of the heat sink;
(2) The liquid working medium is subjected to directional traction through coulomb force, dielectrophoresis force and electric contraction force under the action of an electric field, so that the mass flow of the liquid working medium is increased, the thermal resistance is reduced, and the capillary wetting length of the liquid working medium in a micro-channel is effectively prolonged;
(3) The working wetting length of the micro-groove group is improved, the liquid working medium in the micro-groove channel is effectively and timely supplemented, the situation that the flow of the liquid working medium is blocked and dried under the condition of higher heat flux is prevented, the liquid film distribution is optimized, the high-strength evaporation heat exchange performance of the liquid working medium with an expansion meniscus in the micro-groove group is further enhanced, and the unstable heat exchange and deterioration caused by drying are avoided;
(4) The liquid working medium in the micro-channel can be effectively and timely supplemented, so that the problem of excessive filling of the liquid working medium in the radiator can be solved, and the radiator is light, small in volume and light in weight;
(5) The radiator has the capability of super heat exchange under the action of the nano coating and the electric field, so that the radiator is relatively energy-saving and has low power consumption;
(6) The radiator is portable and small in size, so that the application range is wide.
Drawings
Fig. 1 is a top view of a micro-groove group radiator according to a first embodiment of the present disclosure.
Fig. 2a is a schematic rectangular cross-section of the enclosed cavity of the heat sink of fig. 1.
Fig. 2b is a schematic square cross-section of the enclosed cavity of the heat sink of fig. 1.
Fig. 2c is a schematic view of a triangular cross-section of the enclosed cavity of the heat sink of fig. 1.
Fig. 2d is a schematic cross-sectional view of a fan-shape of the enclosed cavity of the heat sink shown in fig. 1.
Fig. 3 is a structure and a sealing arrangement of a wire electrode in a heat sink closed cavity according to a first embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a micro-groove group heat sink in a micro-groove group heat sink according to a first embodiment of the present disclosure.
Fig. 5 is a diagram of a group of micro-grooves with a nano-scale planar structure of a nano-coating according to a first embodiment of the present disclosure.
Fig. 6 is a diagram of a micro-groove group structure in which the nano-coating is a nano-scale protrusion in the first embodiment of the present disclosure.
Fig. 7 is a schematic view of a wire electrode in a first embodiment of the present disclosure.
Fig. 8 is a schematic view of a line array electrode in a first embodiment of the present disclosure.
Fig. 9 is an effect diagram of the heat sink wetting characteristics and heat exchange performance of the EHD reinforced micro-nano composite structure surface in the closed cavity in the first embodiment of the present disclosure.
Fig. 10 is a schematic diagram of a micro-groove group heat sink in a micro-groove group heat sink according to a second embodiment of the present disclosure.
Fig. 11 is a schematic diagram of a micro-groove group heat sink in a micro-groove group heat sink according to a third embodiment of the present disclosure.
Fig. 12 is a schematic diagram of a micro-groove group heat sink in a micro-groove group heat sink according to a fourth embodiment of the present disclosure.
[ In the drawings, the main reference numerals of the embodiments of the present disclosure ]
10-A micro-nano composite structure surface heat sink;
11-micro-groove group heat sink; 12-nanoscale planar structures;
13-nanoscale protrusions;
20-electrodes;
21-wire electrode; 22-line array electrodes;
23-mesh electrode; 24-needle electrodes;
25-plate electrodes; 26-electrode lead-out terminals;
27-compressing the nut; 28-electrode pads;
30-heating surface;
40-liquid working medium;
50-a closed cavity of the radiator;
51-the rectangular cross section of the closed cavity of the radiator; 52-the square cross section of the closed cavity of the radiator;
53-the triangular cross section of the closed cavity of the radiator; 54-the fan-shaped section of the radiator closed cavity;
60-high voltage power supply;
70-electric wire;
80-fins of a heat sink.
Detailed Description
The present disclosure provides a micro-groove group radiator, comprising a micro-nano composite structure surface heat sink heating surface and a radiating surface, wherein a hydrophilic nano coating is arranged on the micro-nano composite structure surface heat sink; the heat-taking surface and the heat-radiating surface enclose a closed cavity, the closed cavity contains liquid working medium, and a high-voltage electric field is applied to the surface heat sink of the micro-nano composite structure in the cavity to form an EHD effect. The ultra-high surface energy of the hydrophilic nano coating on the micro-nano composite structure surface of the micro-groove group radiator strengthens the surface energy and roughness of the liquid working medium in the micro-groove channel, improves the surface wetting characteristic, exerts a directional traction effect on the liquid working medium by an electric field effect, increases the mass flow of the liquid working medium, ensures that the heat sink continuously generates high-strength composite phase change heat exchange, and strengthens the heat exchange capacity of the radiator.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In a first exemplary embodiment of the present disclosure, a micro-groove group heatsink is provided.
Fig. 1 is a top view of a micro-groove group radiator according to a first embodiment of the present disclosure. As shown in fig. 1, the external appearance of the micro-groove group radiator is a sunflower type radiator, and the micro-groove group radiator comprises a micro-nano composite structure surface heat sink heat taking surface 30 and a heat radiating surface 90, wherein a hydrophilic nano coating is arranged on the micro-nano composite structure surface heat sink; the heat-collecting surface 30 and the heat-dissipating surface 90 are connected and enclosed into a closed cavity 50, a certain amount of liquid working medium is contained in the closed cavity 50, and a high-voltage electric field is applied to the micro-nano composite structure surface heat sink through the electrode in the cavity to form an EHD effect; the heat source is connected to the heat-extracting surface 30 by a high thermal conductivity material, such as a thermally conductive silicone grease, a thermally conductive silicone gel or graphite.
In the closed cavity 50, liquid working medium is injected, a high-voltage electric field is applied to the liquid working medium, and a part of the liquid working medium enters the micro-groove channel and climbs a certain height under the driving of the micro-groove group under the action of the micro-nano composite capillary structure. And a wire electrode is arranged on the surface, which is opposite to the micro channel, of the liquid working medium, the liquid working medium is driven to timely climb to a higher wetting height along the micro channel under the action of the electric field force of positive high voltage, and the composite phase transformation heat effect of ultrahigh-strength evaporation and boiling occurs. After the heat source emits heat, the heat-collecting surface 30 receives and transfers the heat generated by the heat source, high-intensity evaporation and boiling composite phase change heat exchange occurs in the cavity, and the emitted heat is emitted to the external environment through a plurality of heat-radiating fins 80 connected with the radiator.
The following describes each component of the micro-groove group radiator in detail.
Fig. 2 a-2 d are schematic cross-sectional views of the enclosed cavity of the heat sink of fig. 1. As shown in fig. 2 a-2 d, the cross section of the radiator enclosure 50 is rectangular (as shown in fig. 2 a), square (as shown in fig. 2 b), triangular (as shown in fig. 2 c), fan-shaped (as shown in fig. 2 d). The closed cavity 50 is an air cavity or a vacuum cavity.
Fig. 3 is a structure and a sealing arrangement of a wire electrode in a heat sink closed cavity according to a first embodiment of the present disclosure. As shown in fig. 3, two ends of the radiator enclosed cavity 50 are provided with electrode outlet ports 26, wherein an electrode at one end is connected with an electrode terminal into a whole, an electric wire 70 is led out from the upper end of the enclosed cavity, the electric wire 70 is connected with a high-voltage power supply 60 after being led out, and the electrode outlet ports 26 exceed the outside of the radiator enclosed cavity 50 and are connected and fixed through an electrode gasket 28 and a compression nut 27. The closed cavity is a metal cavity, and the wire electrode 21 at the other end of the lower end of the cavity is contacted with the inside of the cavity through one end of a wire, is connected with the electrode gasket 28 and the compression nut 27 through the electrode lead-out terminal 26 and is led out to be grounded.
Fig. 4 is a schematic diagram of a micro-groove group heat sink and an electrode in a micro-groove group heat sink according to a first embodiment of the present disclosure. As shown in fig. 4, the micro-nano composite structure surface heat sink comprises a micro-groove group heat sink 11 and a nano coating 12, wherein the nano coating 12 is generated on the surface of the micro-groove group heat sink 11 and forms a micro-nano composite structure surface heat sink 10 with the micro-groove group heat sink 11; the electrode 20 is a wire electrode, which is connected with a high-voltage power supply to apply an electric field to the liquid working medium on the micro-nano composite structure surface heat sink 10.
As shown in fig. 4, the surface structure of the micro-groove group heat sink 11 is a micro-groove array structure, a nano-groove array structure or a micro-nano composite groove array structure.
The cross section of the micro channel group heat sink 11 is rectangular, triangular or trapezoidal; the equivalent diameter of the micro channel cross section of the micro channel group heat sink 11 is 10 -3 -1000 μm; the surface material of the micro-groove group heat sink 11 is metal, metal oxide, metal nitride, semiconductor material, glass or ceramic.
The external dimension of the micro-groove group heat sink is 80-150 mm, and the width is 20-50 mm; the size of the channel is 0.05-1 mm of the depth of the channel, 0.05-1 mm of the width of the channel and 0.05-1 mm of the interval of the channel;
The nano-coating 12 is a nano-scale planar structure or nano-scale protrusion, wherein; the micro-groove group structure diagram of the nano coating with the nano level plane structure is shown in fig. 5, and the micro-groove group structure diagram of the nano coating with the nano level protrusion is shown in fig. 6. The nano coating is used for strengthening the hydrophilicity and roughness of the surface of the microstructure and increasing the surface energy of the microstructure.
The material of the nano coating 12 is metal, metal oxide, metal fluoride, semiconductor material or organic high polymer paint; the hydrophilic coating is aluminum oxide, titanium oxide or zinc oxide; the thickness of the nano-coating 12 is 0-1000 nm.
In this embodiment, the electrode 20 is a wire electrode, and the wire electrode includes a single wire electrode shown in fig. 7 and a wire array electrode shown in fig. 8.
The characteristic of the arrangement of the wire electrode is that the wire electrode is used as a positive electrode, one end of the wire electrode is arranged above the liquid working medium, namely, the wire electrode is not contacted with the liquid working medium, and the other end of the wire electrode is immersed in the liquid working medium. The negative electrode is an array slot plate of a micro-nano composite structure or a shell of other electrified metal structures.
Referring to FIG. 7, the radius of the wire electrode is 0.3-1 mm, the length is 50-150 mm, the height of the liquid working medium which is over the wire electrode is 5-20 mm, and the vertical distance between the liquid working medium and the axial direction of the heat sink is 1-20 mm.
In this embodiment, the high voltage control is adjustable in the range of 2 to 20 kV.
The liquid working medium is an insulating liquid working medium and comprises FC72, R113, R123, R141, n-pentane and the like.
The closed cavity is under vacuum condition or normal pressure condition.
It should be noted that the electrode 20 may be a mesh electrode, a plate electrode, or a needle electrode.
Thus, the introduction of the micro-groove group radiator of the first embodiment of the present disclosure is completed.
Fig. 9 is an effect diagram of EHD reinforced micro-nano composite structure surface heat sink wetting characteristics and heat exchange performance in a closed cavity. As shown in fig. 9, the micro-groove group heat sink in the embodiment of the present disclosure realizes super heat exchange by:
(1) And preparing a nano coating on the micro-groove group heat sink to form the micro-nano composite structure surface heat sink 10. The nano coating has hydrophilicity and stability, and the nano coating has the function of improving the capillary wettability of the micro-groove group by strengthening the wettability of the heat sink surface of the micro-groove group, so that the capillary wettability of the micro-nano composite structure heat sink is higher when the micro-nano composite structure heat sink is placed at an inclined angle or even vertically, and the realization effect is shown in figure 9.
When the heat source 30 is connected with high heat conductivity materials such as heat conduction silicone grease, heat conduction silica gel and graphene, heat is conducted to the micro-groove group heat sink, the micro-nano composite structure heat sink 10 which is vertically placed and applied is firstly subjected to capillary action of the micro-nano composite structure, the liquid working medium 40 climbs to a certain wetting height along the array micro-groove channel of the micro-nano composite structure, when the ultrahigh heat flow density emitted by the heat source 40 is input in the direction perpendicular to the heat sink, most of the heat exchange surface area of the heat sink is wetted, and at the moment, high-strength composite phase change heat exchange of expanding evaporation of a thin liquid film area on a meniscus and nuclear boiling of a thick liquid film occurs in the micro-groove, so that the heat exchange performance of the liquid working medium 40 is enhanced. While heat is transferred to the heat sink surface outside of the closed cavity 50 for heat dissipation. In the closed cavity 50, the vapor subjected to the composite phase change heat exchange is condensed on the peripheral wall surface, and condensed liquid drops reenter the liquid working medium to realize circulation.
(2) The EHD effect is generated on the surface of the micro-nano composite structure heat sink on the electric field applied to the liquid working medium, and the effect achieved by the EHD effect is shown in fig. 9.
When the micro-nano composite structure is applied, the EHD effect is under the combined action of coulomb force, dielectrophoresis force and electric shrinkage force of an electric field, once local dryness occurs in a micro-channel under the ultrahigh heat flux density, various different forms of electrodes 20 arranged on the opposite surface of the channel act on the liquid working medium 40 on the micro-nano composite structure surface 10, on one hand, the liquid working medium timely pulls up the existing wetting height under the action of the generated electric field force, and on the other hand, the ultrahigh surface energy of the hydrophilic nano coating on the micro-nano composite structure surface can further strengthen the wetting characteristic of the micro-channel, so that the heat sink continuously generates high-strength composite phase change heat exchange, the heat exchange capability of the heat sink is enhanced, the critical heat flux density endured by the heat sink is improved, the heat dissipation problem of power electronic components with high power and ultrahigh heat flux density can be solved, and further, the released heat is transferred to the outside of a closed cavity for heat dissipation and cooling. The timely liquid supplementing capability of the heat sink ensures the reliability of the heat sink with super heat exchange performance.
In a second exemplary embodiment of the present disclosure, a micro-groove group heatsink is provided. Fig. 10 is a schematic diagram of a micro-groove group heat sink and an electrode in a micro-groove group heat sink according to a second embodiment of the present disclosure. As shown in fig. 10, the micro groove group radiator of the present embodiment is different from the micro groove group radiator of the first embodiment in that:
The electrode is a mesh electrode 23. The electrode is arranged in such a way that the electrode acts as a positive electrode, one end of which is above the liquid working medium, i.e. is not in contact with the liquid working medium, and the other end of which is immersed in the liquid working medium. The negative electrode is an array slot plate of a micro-nano composite structure or a shell of other electrified metal structures.
The external dimension of the mesh electrode is 80-150 mm, the width is 20-50 mm (if the mesh electrode is used, the equivalent diameter of the mesh is 0.5-1 mm), the height of the liquid working medium which is not passed through the mesh electrode is 5-20 mm, and the vertical distance between the liquid working medium and the axial direction of the heat sink is adjusted within the range of 1-20 mm.
And injecting liquid working medium into the closed cavity, applying a high-voltage electric field to the liquid working medium, and enabling a part of the liquid working medium to enter the micro-groove channel and climb to a certain height under the driving of the micro-groove group under the action of the micro-nano composite capillary structure. The mesh electrode of figure 10 is arranged on the surface opposite to the micro-channel, the liquid working medium is driven to timely climb to a higher wetting height along the micro-channel under the action of the electric field force of the positive high voltage, and the composite phase transformation heat effect of ultrahigh-strength evaporation and boiling occurs.
For the sake of brevity, any description of the features of the first embodiment that can be used in the same way is incorporated herein, and the same description is not repeated.
Thus, the introduction of the micro-groove group radiator in the second embodiment of the present disclosure is completed.
In a third exemplary embodiment of the present disclosure, a micro-groove group heatsink is provided.
Fig. 1 is a schematic diagram of a micro-groove group heat sink and an electrode in a micro-groove group heat sink according to a third embodiment of the present disclosure. As shown in fig. 11, the micro groove group radiator of the present embodiment is different from the micro groove group radiator of the first embodiment in that:
The electrode is a needle electrode 24, the electrode is in a suspension arrangement as an anode, and the cathode is an array groove plate of a micro-nano composite structure or a shell of other electrified metal structures.
The radius of curvature of the needle electrode tip is 0.05-0.5 mm, and the axial vertical distance between the needle electrode tip and the heat sink can be adjusted within the range of 1-20 mm.
The liquid working medium can be insulating liquid working medium, including FC72, R113, R123, R141, n-pentane and the like; and can also be conductive working medium including distilled water, ethanol, etc.
The enclosed cavity is under normal pressure.
And injecting liquid working medium into the closed cavity, applying a high-voltage electric field to the liquid working medium, and enabling a part of the liquid working medium to enter the micro-groove channel and climb to a certain height under the driving of the micro-groove group under the action of the micro-nano composite capillary structure. The needle-shaped electrode shown in fig. 11 is arranged on the surface opposite to the micro-channel, and generates suction force through ionized air, and the liquid working medium with a certain height in the array channel structure is lifted in time, so that the wetting height is further lifted, and the composite phase transformation heat effect of ultrahigh-strength evaporation and boiling occurs.
For the sake of brevity, any description of the features of the first embodiment that can be used in the same way is incorporated herein, and the same description is not repeated.
Thus, the introduction of the micro-groove group radiator in the third embodiment of the present disclosure is completed.
In a fourth exemplary embodiment of the present disclosure, a micro-groove group heatsink is provided.
Fig. 12 is a schematic diagram of a micro-groove group heat sink and an electrode in a micro-groove group heat sink according to a third embodiment of the present disclosure. As shown in fig. 12, compared with the micro-groove group heat sink with super heat exchange and the preparation method thereof in the first embodiment, the micro-groove group heat sink with super heat exchange and the preparation method thereof in this embodiment are different in that:
The electrode is a flat plate electrode 25, and the electrode arrangement is characterized in that the electrode is taken as a positive electrode, the liquid working medium is soaked in the closed cavity, and the negative electrode is fixed at the upper end of the vertical groove plate.
The length and width of the positive electrode and the negative electrode of the flat plate electrode are 10-30 mm, the positive electrode is immersed in the liquid working medium, and the axial distance between the positive electrode and the negative electrode is 40-100 mm.
The liquid working medium can be insulating liquid working medium, and comprises FC72, R113, R123, R141 and n-pentane; and can also be conductive working medium including distilled water and ethanol.
The closed cavity is under vacuum condition or normal pressure condition.
And injecting liquid working medium into the closed cavity, applying a high-voltage electric field to the liquid working medium, and enabling a part of the liquid working medium to enter the micro-groove channel and climb to a certain height under the driving of the micro-groove group under the action of the micro-nano composite capillary structure. The flat plate electrode shown in fig. 12 is arranged on the surface opposite to the micro-channel, and the positive plate is arranged in the liquid working medium, so that the liquid working medium is driven to timely climb to a certain wetting height along the micro-channel under the action of the electric field force of positive high voltage, and the composite phase transformation heat effect of ultrahigh-strength evaporation and boiling occurs.
Thus, the introduction of the micro-groove group radiator of the fourth embodiment of the present disclosure is completed.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. From the foregoing description, those skilled in the art will readily recognize the micro-groove group radiator of the present disclosure.
It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
In summary, the disclosure provides a micro-groove group radiator, which comprises a micro-nano composite structure surface heat sink heating surface and a radiating surface, wherein a hydrophilic nano coating is arranged on the micro-nano composite structure surface heat sink; the heat-taking surface and the heat-radiating surface enclose a closed cavity, the closed cavity contains liquid working medium, and a high-voltage electric field is applied to the surface heat sink of the micro-nano composite structure in the cavity to form an EHD effect. The ultra-high surface energy of the hydrophilic nano coating on the micro-nano composite structure surface of the micro-groove group radiator strengthens the surface energy and roughness of the liquid working medium in the micro-groove channel, improves the surface wetting characteristic, exerts a directional traction effect on the liquid working medium by an electric field effect, increases the mass flow of the liquid working medium, ensures that the heat sink continuously generates high-strength composite phase change heat exchange, and strengthens the heat exchange capacity of the radiator.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (9)
1. A micro-groove group radiator, comprising:
A heat extraction surface (10) connected to a heat source (30) by a thermally conductive material, comprising:
a micro-groove group heat sink (11);
The nano coating (12) is generated on the surface of the micro-groove group heat sink (11) and forms a micro-nano composite structure surface heat sink with the micro-groove group heat sink (11), and the nano coating (12) is a nano bulge;
The radiating surface (90) and the heat-collecting surface (10) enclose a closed cavity (50), and the closed cavity (50) contains liquid working medium; and
The electrode (20) is a wire electrode, a net electrode, a flat plate electrode or a needle electrode, is arranged in the closed cavity (50), is connected with a high-voltage power supply (60), and is used for applying an electric field to the liquid working medium on the surface heat sink of the micro-nano composite structure, so that the liquid working medium can timely lift the existing wetting height under the action of the electric field; when the electrode (20) is the wire electrode, the wire electrode is used as a positive electrode, one end of the wire electrode is arranged above the liquid working medium, namely is not contacted with the liquid working medium, the other end of the wire electrode is immersed in the liquid working medium, and an array groove plate formed by the micro-nano composite structure surface heat sink is used as a negative electrode; when the electrode (20) is the mesh electrode, the mesh electrode is used as a positive electrode, one end of the mesh electrode is arranged above the liquid working medium, namely is not contacted with the liquid working medium, the other end of the mesh electrode is immersed in the liquid working medium, and an array groove plate formed by the micro-nano composite structure surface heat sink is used as a negative electrode; when the electrode (20) is the flat plate electrode, the flat plate electrode is used as an anode and a cathode, the anode is immersed in the liquid working medium, and the cathode is fixed at the upper end of an array groove plate formed by the micro-nano composite structure surface heat sink; when the electrode (20) is the needle electrode, the needle electrode is used as an anode and arranged above the liquid working medium, and an array groove plate formed by a micro-nano composite structure surface heat sink is used as a cathode of the needle electrode, wherein the needle electrode is in non-contact with the liquid working medium;
After the heat source emits heat, the heat-collecting surface (10) receives and transmits the heat generated by the heat source, high-strength evaporation and boiling composite phase change heat exchange occurs in the closed cavity (50), and the emitted heat is emitted to the external environment through a plurality of heat-radiating fins (80) connected with the radiator.
2. The micro-groove group radiator according to claim 1, wherein,
When the electrode (20) is the wire electrode, electrode outlet ports are formed in two ends of the closed cavity (50), one end of the wire electrode is connected with the electrode outlet terminal (26) into a whole, an electric wire (70) is led out from the upper end of the closed cavity (50), the electric wire (70) is connected with the high-voltage power supply (60), the electrode outlet terminal (26) is fixed to the outside of the closed cavity (50) through an electrode gasket (28) and a compression nut (27), and the other end of the wire electrode is led out to the ground after being connected with the electrode outlet terminal (26), the electrode gasket (28) and the compression nut (27) at the lower end of the closed cavity (50).
3. The micro-groove group radiator according to claim 1, wherein,
The radius of the wire electrode is 0.001-1 mm, the length is 1-500 mm, and the axial vertical distance between the wire electrode and the micro-groove group heat sink (11) is 0.1-100 mm;
The length and width of the mesh electrode are 1-100 mm, the thickness of the mesh electrode is 0.5-10 mm, the equivalent diameter of the mesh electrode is 0.0001-1 mm, and the axial vertical distance between the mesh electrode and the micro-groove group heat sink (11) is 0.1-100 mm;
the length and width of the flat plate electrode are 1-100 mm, the thickness of the flat plate electrode is 0.5-10 mm, and the vertical interval between the positive electrode and the negative electrode of the flat plate electrode is 10-100 mm;
The curvature radius of the needle electrode needle point is 0.01-1 mm, and the axial vertical distance between the needle electrode needle point and the micro-groove group heat sink (11) is 0.1-100 mm.
4. The micro-groove group radiator according to claim 1, wherein,
The voltage of the high-voltage power supply (60) is 1-50 kV.
5. The micro-groove group radiator according to claim 1, wherein,
When the electrode (20) is the wire electrode and the mesh electrode, the liquid working medium of the micro-groove group heat sink (11) is an insulating working medium;
when the electrode (20) is the flat electrode and the needle electrode, the liquid working medium of the micro-groove group heat sink (11) is an insulating working medium or a conductive working medium;
The insulating working medium is FC72, R113, R123, R141 or n-pentane;
the conductive working medium is distilled water or ethanol.
6. The micro-groove group radiator according to claim 1, wherein,
The material of the nano coating (12) is metal, metal oxide, metal fluoride, semiconductor material or organic high polymer coating;
The thickness of the nano coating (12) is 0-1000 nm.
7. The micro-groove group radiator according to claim 1, wherein,
The surface structure of the micro-groove group heat sink (11) is a micro-groove array structure, a nano-groove array structure or a micro-nano composite groove array structure;
The cross section of the micro-channel group heat sink (11) is rectangular, triangular or trapezoidal, and the equivalent diameter is 10 -3 -1000 mu m;
the micro-groove group heat sink (11) is made of metal, metal oxide, metal nitride, semiconductor material, glass or ceramic.
8. The micro-groove group radiator according to claim 1, wherein,
The cross section of the closed cavity (50) is rectangular, square, triangular or fan-shaped;
the closed cavity (50) is an air cavity or a vacuum cavity.
9. The micro-groove group radiator according to claim 1, wherein,
The included angle between the micro-nano composite structure surface heat sink and the horizontal direction is 0-180 degrees.
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| CN109631651B (en) * | 2018-12-06 | 2020-07-07 | 华北电力大学 | Local self-adaptive controllable wettability coupling microstructure enhanced boiling heat exchange method |
| CN109855075B (en) * | 2018-12-06 | 2020-08-04 | 华北电力大学 | Boiling heat exchange surface of wall surface microstructure coupled local electrode |
| CN112366192B (en) * | 2020-12-01 | 2022-09-06 | 哈尔滨工业大学 | Electronic component heat abstractor based on electric field regulation and control solid-liquid phase change |
| CN112611240B (en) * | 2020-12-10 | 2022-07-19 | 武汉大学 | Device and method for enhancing condensation heat exchange by utilizing ion wind |
| CN114340342A (en) * | 2021-12-24 | 2022-04-12 | 广西大学 | Nano-fluid re-suspension type electronic equipment heat dissipation system and heat dissipation method |
| CN114745925B (en) * | 2022-04-22 | 2024-05-28 | 中国科学院工程热物理研究所 | Micro-groove group heat dissipation device with porous dielectric material and heat dissipation method |
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