CN1632441A - Heat transfer process for variable cross section intensive selfoscillatory flow heat pipe - Google Patents
Heat transfer process for variable cross section intensive selfoscillatory flow heat pipe Download PDFInfo
- Publication number
- CN1632441A CN1632441A CNA2005100019795A CN200510001979A CN1632441A CN 1632441 A CN1632441 A CN 1632441A CN A2005100019795 A CNA2005100019795 A CN A2005100019795A CN 200510001979 A CN200510001979 A CN 200510001979A CN 1632441 A CN1632441 A CN 1632441A
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- Prior art keywords
- heat pipe
- pipe
- flow heat
- flow
- variable cross
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Classifications
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- 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
- F28D15/0233—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 the conduits having a particular shape, e.g. non-circular cross-section, annular
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention provides a heat transfer process for variable cross section intensive selfoscillatory flow heat pipe, which adopts variable cross section structure to enforce the heat exchanging capacity of the selfoscillatory flow heat pipe. The selfoscillatory flow heat pipe adopts two different pipe diameters varying and combining in range of 0.5mm-5.0mm and alternatively arranging to form the variable cross section intensive selfoscillatory flow heat pipe, such that flow in the pipe quickly expands along biggish pipe diameter after being heated at heating terminal, and flows to the condensation terminal; and liquid condensed at the condensation terminal returns back the heating terminal along the thinner pipe; because of the different curvature radii of the pipes, the liquid film generates different surface tension, thus additional circular power is obtained. The invention adopts abnormity section structure shape which can be ellipse, spirality, cuniform or anomaly shape.
Description
Technical field
The invention belongs to technical field of heat exchange, particularly provide a kind of variable cross-section to strengthen the method that selfexcited oscillating-flow heat pipe conducts heat.
Background technology
Heat pipe (Heat Pipe) as a kind of heat transfer element efficiently, since the eighties of last century sixties come out, has obtained using widely in various fields.Along with the development of modern high technology, the thermic load on many FU areas that are heated is more and more higher, and bears the occasion of high heat load at these, usually needs cooling or heat transmission equipment microminiaturization again.1994, Japan's scholar's barren land (H.Akachi) has been invented a kind of pulsating heat pipe (Pulsating Heat Pipe) (H.Akachi.Looped Capillary Tube Heat Pipe.Proceedings of 71thGeneral Meeting Conference of JSME of novel concept, Vol.3, No.940-10,1994.) afterwards, be referred to as selfexcited oscillating-flow heat pipe (Self-Exciting Mode Oscillating-FlowHeat Pipe is called for short SEMOS Heat Pipe).
Selfexcited oscillating-flow heat pipe can be divided into two kinds of loop type (Looped) and non-loop types (Un looped) again, as shown in Figure 1 by the difference of its circulatory system.The basic principle of selfexcited oscillating-flow heat pipe operation is: when enough hour of heat pipe caliber, be encapsulated under the vacuum condition working media (distilled water, alcohol etc.) in the pipe will be in pipe the plunger between formation liquid, vapour phase.In bringing-up section, the liquid film between steam bubble or vapour post and the tube wall causes steam bubble to expand because of the constantly evaporation of being heated, and promotes the vapour-liquid plug flow to condensation end condensation contraction, thereby forms bigger pressure reduction between cool and heat ends.Because the vapour-liquid plunger is interspersed, thereby in pipe, produce strong reciprocating vibration motion (, also can form unidirectional oscillating movement) if on some straight length, install the part check valve additional.Its frequency of oscillation is higher than the vapour-liquid cycle frequency in the conventional heat pipe far away.And the Convective Heat Transfer between its working media and heat pipe wall is also strengthened greatly because of the effect that is subjected to violent pulsation stream.
Compare with conventional heat pipe, selfexcited oscillating-flow heat pipe does not need the imbibition core, and layout is got up more flexible, and is more suitable for requiring the occasion of heat transmission equipment microminiaturization.
Summary of the invention
The object of the present invention is to provide a kind of variable cross-section to strengthen the method that selfexcited oscillating-flow heat pipe conducts heat, in order to improve heat transfer property.
The present invention adopts variable section structure to strengthen the heat exchange property of selfexcited oscillating-flow heat pipe.
From the operation principle of selfexcited oscillating-flow heat pipe as can be known, want further to strengthen its heat transfer process, two Basic Ways are arranged: the one, the heat transfer in the enhanced tube between vapour-liquid medium and the tube wall; The one, improve the circulation power of its frequency of oscillation and operation.The tube fluid of this selfexcited oscillating-flow heat pipe and the heat exchange between tube wall, essence are to have two-phase fluid in the unstable state phase transition process and the heat transfer between the wall.Want to strengthen this diabatic process, the intensity that phase change transition frequency of at first will improve fluid evaporator, condensing and phase transformation take place, the Convective Heat Transfer between its minor betterment fluid and tube wall.And to improve the interior frequency of oscillation of pipe and the circulation power of reliability service, and then want the oscillation mechanism in the reinforced pipe, improve the temperature difference of cold and hot fluid in the oscillatory process.
Selfexcited oscillating-flow heat pipe of the present invention adopts variable section structure, comprises ellipse, spirality, wedge shape and other erose selfexcited oscillating-flow heat pipe of waney garden pipe or section structure.
As shown in Figure 2, from improving the circulation power of operation, selfexcited oscillating-flow heat pipe of the present invention adopts two kinds of calibers that vary in size, its pipe diameter changes in 0.5mm～5.0mm scope and makes up, alternately arrange, to constitute the selfexcited oscillating-flow heat pipe of variable cross-section, make tube fluid be heated the back along bigger caliber rapid expanding, and flow to condensation end at fire end.At the condensed liquid of condensation end then along flowing back to fire end than the tubule road.Because the radius of curvature difference of big or small caliber, the surface tension that its liquid film produces are also different, thus obtained additional cycles power is:
In the formula:
σ-be surface tension coefficient;
R
1, R
2-be the radius of curvature of different tube diameters.
As shown in Figure 3, from improving the Convective Heat Transfer of fluid and wall, the present invention adopts section structural shape (as ellipse, spirality, wedge shape and irregularly shaped or the like), this section can be on the pipe basis in the above-mentioned diameter range, be processed into different structural shapes as required, also can adopt direct method for processing.Like this, fluid can strengthen the interior oscillation mechanism of heat pipe, thereby reach the purpose of augmentation of heat transfer because of the backflow disturbance in the flow process in pipe.
As can be seen, two kinds of approach strengthening the selfexcited oscillating-flow heat pipe heat transfer are complementary, and the structural shape of these two kinds of augmentation of heat transfer variable cross-sections also is to give priority to from different augmentation of heat transfer approach, but can take into account mutually again two kinds of approach simultaneously.
The invention has the advantages that the heat transfer efficiency height, simple in structure, be easy to processing.
Description of drawings
Fig. 1 is loop type in the prior art (Looped) and non-loop type (Un looped) selfexcited oscillating-flow heat pipe schematic diagram.
Fig. 2 is the gauge structure variable cross-section selfexcited oscillating-flow heat pipe schematic diagram that do not wait of the present invention.
Fig. 3 is a section structure variable cross-section selfexcited oscillating-flow heat pipe schematic diagram of the present invention.
The specific embodiment
Two end regions of variable cross-section selfexcited oscillating-flow heat pipe contact with low-temperature receiver and thermal source respectively, are solid as cold and heat source, and then the end should be close to the attached surface of solids or imbed solid interior; When being gas or liquid as cold and heat source, then the end should be immersed in the fluid, according to the size decision cold and heat source of heat exchange amount and the contact area of heat pipe.
Claims (2)
1, a kind of variable cross-section is strengthened the method that selfexcited oscillating-flow heat pipe conducts heat, and adopts variable section structure to strengthen the heat exchange property of selfexcited oscillating-flow heat pipe; It is characterized in that: selfexcited oscillating-flow heat pipe adopts two kinds of calibers that vary in size, its pipe diameter changes in 0.5mm～5.0mm scope and makes up, alternately arrange, to constitute the selfexcited oscillating-flow heat pipe of variable cross-section, make tube fluid be heated the back along bigger caliber rapid expanding, and flow to condensation end at fire end; At the condensed liquid of condensation end then along flowing back to fire end than the tubule road; Because the radius of curvature difference of big or small caliber, the surface tension that its liquid film produces are also different, thus obtained additional cycles power is:
In the formula:
σ-be surface tension coefficient; R
1, R
2-be the radius of curvature of different tube diameters.
2, in accordance with the method for claim 1, it is characterized in that: adopting the section structural shape is ellipse or spirality, wedge shape, irregularly shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100019795A CN1632441A (en) | 2005-01-17 | 2005-01-17 | Heat transfer process for variable cross section intensive selfoscillatory flow heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100019795A CN1632441A (en) | 2005-01-17 | 2005-01-17 | Heat transfer process for variable cross section intensive selfoscillatory flow heat pipe |
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| Publication Number | Publication Date |
|---|---|
| CN1632441A true CN1632441A (en) | 2005-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100019795A Pending CN1632441A (en) | 2005-01-17 | 2005-01-17 | Heat transfer process for variable cross section intensive selfoscillatory flow heat pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761380B (en) * | 2010-01-18 | 2012-05-23 | 山东天力干燥股份有限公司 | Automobile engine heat dissipating device based on oscillatory flow heat pipes |
| CN105299540A (en) * | 2015-11-05 | 2016-02-03 | 广州百年光电技术开发有限公司 | Self-exciting type loop heat pipe sunflower heat dissipation module and large-power LED tube light |
| WO2017181529A1 (en) * | 2016-04-22 | 2017-10-26 | 南京佳力图机房环境技术股份有限公司 | Oscillation induction based bidirectional flow heat exchanger |
| CN110906767A (en) * | 2018-09-14 | 2020-03-24 | 财团法人工业技术研究院 | Three-dimensional pulse type heat pipe, three-dimensional pulse type heat pipe set and heat dissipation module |
| US10883768B2 (en) | 2017-10-13 | 2021-01-05 | Cooler Master Co. Ltd. | Pulsating vapor chamber |
| US11359874B2 (en) | 2020-10-19 | 2022-06-14 | Industrial Technology Research Institute | Three dimensional pulsating heat pipe |
-
2005
- 2005-01-17 CN CNA2005100019795A patent/CN1632441A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761380B (en) * | 2010-01-18 | 2012-05-23 | 山东天力干燥股份有限公司 | Automobile engine heat dissipating device based on oscillatory flow heat pipes |
| CN105299540A (en) * | 2015-11-05 | 2016-02-03 | 广州百年光电技术开发有限公司 | Self-exciting type loop heat pipe sunflower heat dissipation module and large-power LED tube light |
| WO2017181529A1 (en) * | 2016-04-22 | 2017-10-26 | 南京佳力图机房环境技术股份有限公司 | Oscillation induction based bidirectional flow heat exchanger |
| 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 |
| CN110906767A (en) * | 2018-09-14 | 2020-03-24 | 财团法人工业技术研究院 | Three-dimensional pulse type heat pipe, three-dimensional pulse type heat pipe set and heat dissipation module |
| 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 |
| US11359874B2 (en) | 2020-10-19 | 2022-06-14 | Industrial Technology Research Institute | Three dimensional pulsating heat pipe |
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