CN202614703U - Quick determination device of convective heat transfer coefficient of surface of thermo-technical test piece - Google Patents
Quick determination device of convective heat transfer coefficient of surface of thermo-technical test piece Download PDFInfo
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- CN202614703U CN202614703U CN 201220010805 CN201220010805U CN202614703U CN 202614703 U CN202614703 U CN 202614703U CN 201220010805 CN201220010805 CN 201220010805 CN 201220010805 U CN201220010805 U CN 201220010805U CN 202614703 U CN202614703 U CN 202614703U
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Abstract
The utility model discloses a device which is a quick determination method for a convective heat transfer coefficient of a surface of a test piece by using a measured value of temperature of the surface of the test piece based on a change rule of a transient temperature field of the test piece to be tested under third boundary conditions, and further provides a device capable of performing testing under a high surface heat exchange strength condition. The device comprises an air supply pipe, a computer temperature detection system, a pressure stabilizing chamber I, an insulating back plate, a pressure stabilizing chamber II and an exhaust port, wherein a thermocouple junction is arranged in the air supply pipe; the computer temperature detection system comprises a temperature adjuster and an A/D (Analog/Digital) conversion board; and a thermocouple junction, a computer temperature detection system and a test piece drawer are arranged in the insulating back plate. When the device works, the test piece to be tested is placed in the test piece drawer to measure the temperature during stable work of the device; and a fan is additionally arranged to supply air from the air supply pipe to quicken forcible convective heat exchange of the surface of the test piece and measure the temperature of the upper surface of the test piece. Quick determination of the convective heat transfer coefficient of the surface of the test piece can be realized by calculating temperature difference (excess temperature) of the two temperatures. The device is simple, convenient, intelligent and flexible, the idea of energy conservation and environmental protection is realized on the basis of durability and practicability, and the device can be widely applied by scientific research laboratories and can also be applied to research and calculation of the thermo-technical aspect.
Description
Technical field
Along with development of science and technology and innovation, photo-thermal devices such as high-power LED lighting fixture will get into huge numbers of families.And the surperficial convection transfer rate of photo-thermal device is a kind of important physical parameter of thermal technology's calculating aspect, and it is designed with very important reference value to the encapsulation and the optimizing thermal solution of device.Up to now, his-and-hers watches have carried out big quantity research in the face of definite method of the stream coefficient of heat transfer both at home and abroad, have proposed kinds of experiments emulation mensuration or numerical computation method.
The present invention--the fast measuring device of thermal technology's test specimen surface convection transfer rate belongs to the technological brand-new application of thermal measurement.It is a kind of Changing Pattern based on test specimen transient state temperature field to be measured under the third boundary condition; Utilize the rapid assay methods of its surperficial convection transfer rate of measured value reckoning of test specimen surface temperature; And then a kind of device that can under high surfaces heat transfer intensity condition, test of design; Simple and easy convenient, intelligence has flexibly realized the theory of energy-conserving and environment-protective again on the basis of prolonged practicality.
Background technology
Traditional calculating about surperficial convection transfer rate has: 1, based on the temperature field modeling and simulating, utilize temperature field and fluid field coupling analysis, obtain the temperature of photo-thermal device model measurement point, utilize numerical analysis to carry out data fitting and calculate.But temperature field modeling and simulating difficulty is big, the data computation more complicated, and physical parameter is many, will inevitably increase the error of calculation.2, utilize iterative numerical approach, and combine the experimental formula in the convection heat transfer to find the solution.Though method is fairly simple, what obtain is the comprehensive convection transfer rate of photo-thermal device surface, can not well reflect the heat dissipation characteristics that it is surperficial, aspect accuracy, also remains to be investigated.
How on basis rapidly and efficiently, calculate the surperficial convection transfer rate of photo-thermal device exactly, become an important topic of heat power engineering research.
Summary of the invention
This paper proposes a kind of rapid assay methods of utilizing photo-thermal device surface observed temperature value directly to extrapolate surperficial convection transfer rate, and measured physical quantity only is the surface temperature of photo-thermal device.Through using the proving installation of this paper design; Not only can under high surfaces heat transfer intensity condition, test fast; And the measurement range of surperficial convection transfer rate is widened, also possibly measure the surperficial convection transfer rate of other low heat conductivities ability exothermic materials.
Technical matters to be solved by this invention is, on basis rapidly and efficiently, calculates the surperficial convection transfer rate of photo-thermal device exactly, and is easy and simple to handle, energy-conserving and environment-protective.
The technical scheme that the present invention adopts is: ajutage, built-in thermoelectric idol contact, computer temperature detection system; Comprise temperature regulator and A/D change-over panel, pressure stabilizing chamber I, insulating pad; Built-in thermoelectric idol contact, computer temperature detection system and test specimen drawer, pressure stabilizing chamber II and exhausr port; The alternating current of 220v is inserted blower fan and computer temperature control system, make their operate as normal; The wind that blower fan blows out is sent into the air channel that is built-in with thermal cross and computer temperature detection system by ajutage; Get into pressure stabilizing chamber I; Through being placed on the test specimen upper surface to be measured of the stabilized operating temperature in the test specimen drawer in the insulating pad; Carry out forced-convection heat transfer, then flow out whole contrive equipment via pressure stabilizing chamber II and exhausr port.
Ajutage comprises thermal cross and computer temperature detection system.The parallel-connected thermo couple of laying in the device is placed directly in the main flow of air-flow, has avoided the compensation problem of thermocouple cold junction, has simplified test macro.The computer temperature detection system of installing adopts automatic recording mode to the temperature real-time sampling, can improve measuring accuracy and computing velocity greatly.
The computer temperature detection system comprises temperature regulator and A/D change-over panel.Utilize computing machine repeatedly to sample at synchronization.After sampled data carried out the filtering average treatment, the temperature test precision is greatly improved.Simultaneously, computing machine can be accomplished the sampling of data, processing, the control of test duration, the match of curve, the output of result of calculation etc. again in the lump, has improved work efficiency greatly.
The also built-in test specimen drawer of insulating pad so that laying of test specimen to be measured prevents scattering and disappearing without reason of heat, thereby guarantees the accuracy of measuring and calculating.
The present invention needs external 220V general lighting power supply, to guarantee the operate as normal of blower fan and computer temperature control system.
Description of drawings
Fig. 1 is an one-piece construction block diagram of the present invention;
Fig. 2 is the internal structure design drawing of apparatus of the present invention.
Embodiment
Below in conjunction with instance and accompanying drawing the fast measuring device of surperficial convection transfer rate of the present invention is made detailed description.
As shown in Figure 1, alternating current access blower fan and computer temperature control system with 220v make their operate as normal.The wind that blower fan blows out is sent into the air channel that is built-in with thermal cross and computer temperature detection system by ajutage; Get into pressure stabilizing chamber I; Through being placed on the test specimen upper surface to be measured of the stabilized operating temperature in the test specimen drawer in the insulating pad; Carry out forced-convection heat transfer, then flow out whole contrive equipment via pressure stabilizing chamber II and exhausr port.
As shown in Figure 2 is the internal structure design drawing of apparatus of the present invention.From figure, can at length see the indoor design of whole contrive equipment, can understand clearly the function of a whole set of contrive equipment in conjunction with Fig. 1.
Claims (4)
1. based on the fast measuring device of thermal technology's test specimen surface convection transfer rate, it is characterized in that also being provided with: ajutage, built-in thermoelectric idol contact; The computer temperature detection system; Comprise temperature regulator and A/D change-over panel, pressure stabilizing chamber I, insulating pad; Built-in thermoelectric idol contact, computer temperature detection system and test specimen drawer, pressure stabilizing chamber II and exhausr port; The alternating current of 220v is inserted blower fan and computer temperature control system, make their operate as normal; The wind that blower fan blows out is sent into the air channel that is built-in with thermal cross and computer temperature detection system by ajutage; Get into pressure stabilizing chamber I; Through being placed on the test specimen upper surface to be measured of the stabilized operating temperature in the test specimen drawer in the insulating pad; Carry out forced-convection heat transfer, then flow out whole contrive equipment via pressure stabilizing chamber II and exhausr port.
2. the fast measuring device of thermal technology's test specimen according to claim 1 surface convection transfer rate, its characteristic is that also ajutage is built-in with thermal cross and computer temperature detection system; The parallel-connected thermo couple of laying in the device is placed directly in the main flow of air-flow; The computer temperature detection system of installing adopts automatic recording mode to the temperature real-time sampling.
3. the fast measuring device of thermal technology's test specimen according to claim 1 surface convection transfer rate, its characteristic is that also described computer temperature detection system comprises temperature regulator and A/D change-over panel; Utilize computing machine repeatedly to sample, and sampled data is carried out the filtering average treatment at synchronization.
4. the fast measuring device of thermal technology's test specimen according to claim 1 surface convection transfer rate, its characteristic is that also the also built-in test specimen drawer of described insulating pad is used to lay test specimen to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220010805 CN202614703U (en) | 2012-01-12 | 2012-01-12 | Quick determination device of convective heat transfer coefficient of surface of thermo-technical test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220010805 CN202614703U (en) | 2012-01-12 | 2012-01-12 | Quick determination device of convective heat transfer coefficient of surface of thermo-technical test piece |
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| Publication Number | Publication Date |
|---|---|
| CN202614703U true CN202614703U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220010805 Expired - Fee Related CN202614703U (en) | 2012-01-12 | 2012-01-12 | Quick determination device of convective heat transfer coefficient of surface of thermo-technical test piece |
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| CN (1) | CN202614703U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512919A (en) * | 2013-10-16 | 2014-01-15 | 中国航天空气动力技术研究院 | Method for determining backing quantity at highest heat flow position in tilt wing front edge ablation test |
| CN105136848A (en) * | 2015-09-16 | 2015-12-09 | 北京邮电大学 | Convective heat transfer coefficient and convective mass transfer coefficient test device and method |
| CN105628733A (en) * | 2016-01-16 | 2016-06-01 | 黑龙江科技大学 | Device and method for monitoring change in temperature field characteristics in gas hydration separation reaction process |
-
2012
- 2012-01-12 CN CN 201220010805 patent/CN202614703U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512919A (en) * | 2013-10-16 | 2014-01-15 | 中国航天空气动力技术研究院 | Method for determining backing quantity at highest heat flow position in tilt wing front edge ablation test |
| CN103512919B (en) * | 2013-10-16 | 2015-12-09 | 中国航天空气动力技术研究院 | The retrogressing amount defining method of the highest heat flow position in deflector vane leading edge ablation test |
| CN105136848A (en) * | 2015-09-16 | 2015-12-09 | 北京邮电大学 | Convective heat transfer coefficient and convective mass transfer coefficient test device and method |
| CN105136848B (en) * | 2015-09-16 | 2017-12-22 | 北京邮电大学 | Convection transfer rate, convective transfer coefficient test device and method |
| CN105628733A (en) * | 2016-01-16 | 2016-06-01 | 黑龙江科技大学 | Device and method for monitoring change in temperature field characteristics in gas hydration separation reaction process |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20140112 |