CN101424491A - Pulsating heat pipe with stable one-way circulation flow - Google Patents
Pulsating heat pipe with stable one-way circulation flow Download PDFInfo
- Publication number
- CN101424491A CN101424491A CN 200810239934 CN200810239934A CN101424491A CN 101424491 A CN101424491 A CN 101424491A CN 200810239934 CN200810239934 CN 200810239934 CN 200810239934 A CN200810239934 A CN 200810239934A CN 101424491 A CN101424491 A CN 101424491A
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- heat pipe
- pulsating heat
- pipe
- unidirectional
- circulates
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- 230000000694 effects Effects 0.000 claims abstract description 19
- 210000005239 tubule Anatomy 0.000 claims description 8
- 239000012071 phase Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 7
- 230000005494 condensation Effects 0.000 description 6
- 238000009833 condensation Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000005514 two-phase flow Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
本发明公开了属于传热元件范围的一种具有稳定单向循环流动的脉动热管。该脉动热管由在两段不同内径的管之间连接一段渐扩管构成。其渐扩管道可以减少流道的对称性和均衡性，合理匹配流动阻力，并且由于汽液表面张力的作用产生微泵效应，引导工质向粗管方向运动，形成单向循环流动。其优点是，结构简单，可靠性好，实现型式多样，采用此新结构可以增强脉动热管运行的稳定性及可控性，提高脉动热管的传热性能。
The invention discloses a pulsating heat pipe with stable unidirectional circulation flow belonging to the range of heat transfer elements. The pulsating heat pipe is composed of a section of expanding tube connected between two sections of tubes with different inner diameters. Its gradually expanding pipeline can reduce the symmetry and balance of the flow channel, reasonably match the flow resistance, and produce a micro-pump effect due to the effect of the vapor-liquid surface tension, guide the working fluid to move in the direction of the thick tube, forming a one-way circulation flow. The utility model has the advantages of simple structure, good reliability, and various implementation types. The adoption of this new structure can enhance the stability and controllability of the operation of the pulsating heat pipe, and improve the heat transfer performance of the pulsating heat pipe.
Description
Technical field
The invention belongs to the heat transfer element scope, can make particularly that two-phase flow has directionality in the pulsating heat pipe, help to realize unidirectional circular flow a kind of have stablize the unidirectional pulsating heat pipe that circulates.
Background technology
Pulsating heat pipe is a kind of high-performance heat transfer components, it is mobile that pulsating heat pipe utilizes phase transformation to produce steam bubble driving working medium, though relatively simple for structure, its internal mechanism is very complicated, relate to stream-liquid two-phase flow system multidisciplinary, multi-parameter, experiment and theoretical research all are scarcely out of swaddling-clothes.
The mobile stream-liquid two-phase flow that belongs in the micro-channel of pulsating heat pipe inside is moving, the pressure of its internal working medium, temperature and speed all present pulsating nature in the running, have many heating power energy imbalances, therefore, its operation characteristic has very big randomness and complexity.From flow direction, flowing of working medium can be divided into pulsation stream and circular flow in the pulsating heat pipe.Unidirectional circulate of working medium in pipe can be improved by evaporator section and be carried to the working medium of condensation segment, strengthens the heat transmission, improves the heat transfer property of pulsating heat pipe.But in the actual motion, stable unidirectional circular flow is difficult to keep, the staggered appearance of fluidised form such as pulse in common and part, stagnation, reverse refluence, and it is very complicated to move phenomenon.Therefore, the controllability of the stability of pulsating heat pipe operation and heat transfer has much room for improvement.
Summary of the invention
The purpose of this invention is to provide a kind of have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that: this pulsating heat pipe is to connect one section increaser to constitute between the pipe of two sections different inner diameters.
The pipe of described two sections different inner diameters, internal diameter of the pipeline satisfies
In the formula, D
1Be internal diameter of the pipeline, σ is a surface tension, ρ
i, ρ
gBe working medium liquid phase and vapour phase density.
The pipe of described two sections different inner diameters has reduced the symmetry and the harmony of pulsating heat pipe runner, the mobile of a certain direction is dominant, thereby has improved the possibility that forms unidirectional circular flow.
The pipe of described two sections different inner diameters, extra heavy pipe is lower than the flowing velocity in the tubule, causes flow resistance less thus, therefore can reach the effect of reasonable coupling flow resistance, and guiding working medium forms unidirectional circulating to the motion of extra heavy pipe direction.
In the described pulsating heat pipe, the periodic plug shape steam bubble that produces, because the internal diameter difference of pipeline, the radius of curvature of steam bubble meniscus also can change, and under surface tension effects, will produce the Micropump effect.
The heat conduction of described pulsating heat pipe and flow duct, effect are similar to a check valve.
The invention has the beneficial effects as follows, help to realize that the unidirectional of working medium circulates in the pulsating heat pipe, improve by evaporator section and carry, improve the heat transfer property of pulsating heat pipe, strengthen the stability and the controllability of pulsating heat pipe operation to the working medium of condensation segment.
Description of drawings
Fig. 1 is a principle schematic of the present invention.
Fig. 2 is the modified pulsating heat pipe that adopts new construction.
Fig. 3 is the Micropump effect schematic diagram of new construction.
Fig. 4 is the thermal resistance comparison diagram of common pulsating heat pipe and modified pulsating heat pipe.
Fig. 5 is the flow pattern real scene shooting picture of modified pulsating heat pipe.
1. tubules among the figure, 2. increaser, 3. extra heavy pipe, 4. modified pulsating heat pipe, 5. steam bubble.
The specific embodiment
The invention provides a kind of have stablize the unidirectional pulsating heat pipe that circulates.Illustrated below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Figure 1, this pulsating heat pipe is to connect one section increaser to constitute between the pipe of two sections different inner diameters.Promptly between tubule 1 and extra heavy pipe 3, connect one section flaring pipeline 2 and constitute, form one section complete flow channel.
Embodiment 2:
Be illustrated in figure 2 as the modified pulsating heat pipe.Pipeline is bent to a plurality of elbows, and the liquid in the pipe is heated and cools off, and produces phase transformation, flows by phase transition process and working medium and transmits heat, and pulsating heat pipe can cool off electronic device.At the lower left quarter of pipeline one segment length 100mm, the extra heavy pipe of internal diameter 2mm have been installed; It is 1.6mm that other parts keep internal diameter.This architecture advances has been equivalent in the low order end pipe applications new construction of the present invention.
One section extra heavy pipe installing has destroyed the symmetry and the harmony of pulsating heat pipe runner, and its effect is similar to a check valve, interior the mobile of a certain direction of working medium of pulsating heat pipe is dominant, thereby has improved the possibility that forms unidirectional circular flow.
Fluid flows in pipeline need overcome flow pressure drop.Wherein, friction pressure drop is:
(τ when the inside pipe wall surface appearance is identical with the working medium rerum natura
wIdentical) time, extra heavy pipe will diminish than the friction pressure drop in the tubule, and this helps working medium and moves to the extra heavy pipe direction; Gravitational pressure drop is:
The working medium of equal in quality fluid column in extra heavy pipe is shorter, and gravitational pressure drop is littler, and this also helps working medium and moves to the extra heavy pipe direction.As seen, for the modified pulsating heat pipe, friction pressure drop and gravitational pressure drop in the extra heavy pipe are less, and flow resistance is less, therefore can reach the effect of reasonable coupling flow resistance, and guiding working medium forms unidirectional circulating to the motion of extra heavy pipe direction.
Embodiment 3:
Fig. 3 is a Micropump effect schematic diagram.In flaring pipeline 2, if periodically produce steam bubble 5, because pipe shape is the flaring feature, mandatory variation takes place in the radius of curvature of steam bubble meniscus, under surface tension effects, will produce the Micropump effect.
Surface tension effects makes between the inside and outside liquid of steam bubble and produces pressure reduction,
Therefore have,
In the formula, p
vBe steam pressure in the steam bubble; p
1And p
2Be respectively the fluid pressure of outside tubule of steam bubble and extra heavy pipe one side; R
1And R
2Be respectively the radius of curvature of steam bubble, because pipe shape is flaring feature, R at tubule and extra heavy pipe lateral bending lunar surface
1＜R
2σ is a surface tension coefficient.
As can be seen, in order to keep pressure balance, steam bubble is surveyed the upstream outward and must be that is to say that than the fluid pressure in tubule road the steam bubble in the capillary flaring pipeline provides a pressure head less than the fluid pressure of downstream than the extra heavy pipe road, produces the Micropump effect.There is capillary flaring pipeline in modified pulsating heat pipe 4 at evaporator section.Steam bubble constantly generates in capillary flaring pipeline, grows up, and leaves, and this has just produced the Micropump effect, drives working medium to thicker pipeline motion.
Fig. 4 has compared the size of thermal resistance when the different heat transfer amount of two kinds of pulsating heat pipes, and working medium is absolute ethyl alcohol, and liquid filled ratio is 50%.Modified pulsating heat pipe 4 helps the formation of circular flow and keeps, and improves by evaporator section and carries to the working medium of condensation segment, strengthens the heat transmission, thereby reduces thermal resistance, improves the heat transfer property of pulsating heat pipe.During Q＜30W, two kinds of pulsating heat pipe thermal resistance sizes are close; At Q〉under the situation of 30W, the thermal resistance of modified pulsating heat pipe 4 is low.
Fig. 5 is when circular flow occurring, the real scene shooting picture of four adjacent channel adiabatic sections of modified type pulsating heat pipe.At this moment, working medium is absolute ethyl alcohol, and liquid filled ratio is 50%, and heating power is 60W.In four pipelines, slug flow and annular flow are interspersed, and tube wall temperature also colds and heat succeed each other thereupon, and the whole one-way flow trend of working medium is obvious.In the A pipe, slug flow down is moved into evaporator section, because heating power is bigger, behind U type pipe, the steam that fluid column is evaporated, is difficult to form fluid column in B pipe adiabatic section to the condensation segment flow at high speed under the impact of steam, and flow pattern flows in the form of a ring; To the steam condensation of condensation segment rear section, vapor (steam) velocity reduces, and is developed into fluid column, forms slug flow in the C pipe.Equally, the slug flow in the C pipe enters U type evaporator section, and high velocity vapor is flowed through, and D is tubular to flow circlewise.
The present invention realizes that pattern is various, can arrange a plurality of new constructions as required in the whole length of pulsating heat pipe.The above embodiment of the present invention only is used for illustrating technical scheme of the present invention, and it should not limit protection scope of the present invention, and the equivalent transformation as if technical scheme in the foregoing description is made all should belong to the scope of protection of the invention.
Claims (6)
1. one kind has and stablizes the unidirectional pulsating heat pipe that circulates, and it is characterized in that, this pulsating heat pipe is to connect one section increaser to constitute between the pipe of two sections different inner diameters.
According to claim 1 described have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that, the pipe of described two sections different inner diameters, internal diameter of the pipeline satisfies
In the formula, D
iBe internal diameter of the pipeline, σ is a surface tension, ρ
l, ρ
gBe working medium liquid phase and vapour phase density.
According to claim 1 described have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that the pipe of described two sections different inner diameters has reduced the symmetry and the harmony of pulsating heat pipe runner, the mobile of a certain direction is dominant, thereby improved the possibility that forms unidirectional circular flow.
According to claim 1 described have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that, the pipe of described two sections different inner diameters, extra heavy pipe is lower than the flowing velocity in the tubule, cause flow resistance less thus, therefore can reach the effect of reasonable coupling flow resistance, guiding working medium forms unidirectional circulating to the motion of extra heavy pipe direction.
According to claim 1 described have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that, in the described pulsating heat pipe, the periodic plug shape steam bubble that produces, because the internal diameter difference of pipeline, the radius of curvature of steam bubble meniscus also can change, and under surface tension effects, will produce the Micropump effect.
According to claim 1 described have stablize the unidirectional pulsating heat pipe that circulates, it is characterized in that the heat conduction of described pulsating heat pipe and flow duct, effect are similar to a check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810239934 CN101424491A (en) | 2008-12-15 | 2008-12-15 | Pulsating heat pipe with stable one-way circulation flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810239934 CN101424491A (en) | 2008-12-15 | 2008-12-15 | Pulsating heat pipe with stable one-way circulation flow |
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| Publication Number | Publication Date |
|---|---|
| CN101424491A true CN101424491A (en) | 2009-05-06 |
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|---|---|---|---|
| CN 200810239934 Pending CN101424491A (en) | 2008-12-15 | 2008-12-15 | Pulsating heat pipe with stable one-way circulation flow |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957152A (en) * | 2010-10-15 | 2011-01-26 | 浙江大学 | Novel pulsation heat pipe for non-inclination starting operation |
| CN104121794A (en) * | 2014-07-25 | 2014-10-29 | 中国科学院工程热物理研究所 | One-way loop gravity assisted heat pipe and manufacturing method thereof |
| CN106052441A (en) * | 2016-07-29 | 2016-10-26 | 苏州聚力电机有限公司 | One-way cyclic starting structure of novel oscillation type heat conduction device |
| CN106091762A (en) * | 2016-07-29 | 2016-11-09 | 苏州聚力电机有限公司 | The one-way circulation of oscillatory type heat-transfer device starts structure |
| CN106643239A (en) * | 2016-12-23 | 2017-05-10 | 华南理工大学 | Closed one-way operation pulsating heat tube heat transfer system driven by peristaltic pump and method |
| CN110081750A (en) * | 2019-05-17 | 2019-08-02 | 中国科学技术大学 | A kind of pulsating heat pipe with nozzle arrangements |
| CN110595240A (en) * | 2019-09-02 | 2019-12-20 | 华北电力大学 | A large-scale annular pulsating heat pipe |
| US10782079B2 (en) | 2018-09-14 | 2020-09-22 | Industrial Technology Research Institute | Three-dimensional pulsating heat pipe, three-dimensional pulsating heat pipe assembly and heat dissipation module |
| US10883768B2 (en) | 2017-10-13 | 2021-01-05 | Cooler Master Co. Ltd. | Pulsating vapor chamber |
| CN113280668A (en) * | 2021-06-29 | 2021-08-20 | 中国科学技术大学 | Unidirectional pulsating heat pipe with pipeline of asymmetric structure |
| CN113710982A (en) * | 2019-05-08 | 2021-11-26 | 株式会社日立制作所 | Self-oscillating heat pipe cooling device and railway vehicle equipped with same |
| US11359874B2 (en) | 2020-10-19 | 2022-06-14 | Industrial Technology Research Institute | Three dimensional pulsating heat pipe |
-
2008
- 2008-12-15 CN CN 200810239934 patent/CN101424491A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957152A (en) * | 2010-10-15 | 2011-01-26 | 浙江大学 | Novel pulsation heat pipe for non-inclination starting operation |
| CN104121794A (en) * | 2014-07-25 | 2014-10-29 | 中国科学院工程热物理研究所 | One-way loop gravity assisted heat pipe and manufacturing method thereof |
| CN104121794B (en) * | 2014-07-25 | 2018-05-11 | 中国科学院工程热物理研究所 | A kind of unidirectional loop gravity assisted heat pipe and its manufacture method |
| CN106052441A (en) * | 2016-07-29 | 2016-10-26 | 苏州聚力电机有限公司 | One-way cyclic starting structure of novel oscillation type heat conduction device |
| CN106091762A (en) * | 2016-07-29 | 2016-11-09 | 苏州聚力电机有限公司 | The one-way circulation of oscillatory type heat-transfer device starts structure |
| CN106643239A (en) * | 2016-12-23 | 2017-05-10 | 华南理工大学 | Closed one-way operation pulsating heat tube heat transfer system driven by peristaltic pump and method |
| US10883768B2 (en) | 2017-10-13 | 2021-01-05 | Cooler Master Co. Ltd. | Pulsating vapor chamber |
| US11885571B2 (en) | 2017-10-13 | 2024-01-30 | Cooler Master Co., Ltd. | Pulsating vapor chamber |
| US10782079B2 (en) | 2018-09-14 | 2020-09-22 | Industrial Technology Research Institute | Three-dimensional pulsating heat pipe, three-dimensional pulsating heat pipe assembly and heat dissipation module |
| CN113710982A (en) * | 2019-05-08 | 2021-11-26 | 株式会社日立制作所 | Self-oscillating heat pipe cooling device and railway vehicle equipped with same |
| CN113710982B (en) * | 2019-05-08 | 2023-05-30 | 株式会社日立制作所 | Self-oscillation heat pipe cooling device and railway vehicle equipped with same |
| CN110081750A (en) * | 2019-05-17 | 2019-08-02 | 中国科学技术大学 | A kind of pulsating heat pipe with nozzle arrangements |
| CN110595240A (en) * | 2019-09-02 | 2019-12-20 | 华北电力大学 | A large-scale annular pulsating heat pipe |
| US11359874B2 (en) | 2020-10-19 | 2022-06-14 | Industrial Technology Research Institute | Three dimensional pulsating heat pipe |
| CN113280668A (en) * | 2021-06-29 | 2021-08-20 | 中国科学技术大学 | Unidirectional pulsating heat pipe with pipeline of asymmetric structure |
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Open date: 20090506 |