CN220771999U - Sudden expansion type pulsating heat pipe - Google Patents
Sudden expansion type pulsating heat pipe Download PDFInfo
- Publication number
- CN220771999U CN220771999U CN202322593161.3U CN202322593161U CN220771999U CN 220771999 U CN220771999 U CN 220771999U CN 202322593161 U CN202322593161 U CN 202322593161U CN 220771999 U CN220771999 U CN 220771999U
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- CN
- China
- Prior art keywords
- sealed pipeline
- section
- heat pipe
- pulsating heat
- sudden expansion
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Links
- 238000001704 evaporation Methods 0.000 claims abstract description 30
- 230000008020 evaporation Effects 0.000 claims abstract description 28
- 238000009833 condensation Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 230000005494 condensation Effects 0.000 claims abstract description 19
- 238000009413 insulation Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000012546 transfer Methods 0.000 abstract description 14
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model provides a sudden expansion type pulsating heat pipe, belongs to pulsating heat pipe technical field, and the device includes sealed pipeline, sealed pipeline be oval, sealed pipeline divide into triplex from the bottom up, evaporation zone, adiabatic section and condensation segment, the sealed pipeline pipe diameter of evaporation zone is greater than the sealed pipeline pipe diameter of adiabatic section, evaporation zone and adiabatic section junction form sudden expansion structure, the sealed pipeline pipe diameter of adiabatic section is greater than the pipe diameter of condensation segment sealed pipeline, adiabatic section and condensation segment junction form sudden expansion structure sealed pipeline inside packing working fluid. The evaporation section of the sudden expansion type pulsating heat pipe can store more working fluid, so that the bubble flow range is enlarged, the occurrence of hot spots is reduced, and the pulsating heat pipe is facilitated to perform heat transfer more stably. The abrupt expansion structure in the abrupt expansion type pulsating heat pipe can increase the speed and the turbulence degree of the working fluid, thereby promoting the mixing of the working fluid and the heat transfer, and improving the heat transfer efficiency.
Description
Technical Field
The utility model relates to the technical field of pulsating heat pipes, in particular to a sudden expansion type pulsating heat pipe.
Background
The pulsating heat pipe technology is a novel heat pipe technology which utilizes capillary action and evaporation-condensation circulation principles to realize efficient heat transfer and heat energy control. Because the pulsating heat pipe has high heat transfer efficiency, uniform heat transfer, high reliability, long service life, simple structure and the like. Therefore, they are widely used in many fields such as electronic equipment cooling and solar energy utilization. With the progress of technology, pulsating heat pipes with more powerful performance are receiving more and more attention. Although scholars at home and abroad carry out a large number of numerical simulation and experiments, the running mechanism of the pulsating heat pipe is quite complex, the flows of different positions of the pulsating heat pipe are often asynchronous, uneven temperature or overhigh partial pressure can be caused, the evaporation section is easy to burn out, and meanwhile, the manufacturing cost of the pulsating heat pipe is relatively high, and because the complicated structure and the processing technology of the pulsating heat pipe need high-precision manufacturing and processing, the pulsating heat pipe structure further needs to be researched and improved, and the method has great significance.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides the sudden expansion type pulsating heat pipe which can store more working fluid, enlarge the bubble flow range, reduce the occurrence of hot spots, is beneficial to the pulsating heat pipe to perform heat transfer more stably and improves the heat transfer efficiency.
In order to achieve the above object, the technical scheme of the present utility model is as follows:
the utility model provides a sudden expansion type pulsating heat pipe, includes sealed pipeline, sealed pipeline be oval, sealed pipeline divide into triplex from the bottom up, evaporation zone, heat insulation section and condensation segment, the sealed pipeline pipe diameter of evaporation zone is greater than the sealed pipeline pipe diameter of heat insulation section, evaporation zone and heat insulation section junction form sudden expansion structure, the sealed pipeline pipe diameter of heat insulation section is greater than the pipe diameter of the sealed pipeline of condensation segment, heat insulation section and the inside packing working fluid of sealed pipeline of condensation segment junction formation sudden expansion structure.
Further, the lengths of the evaporation section, the heat insulation section and the condensation section are equal.
Further, the outer end of the evaporation section is wound with a resistance wire, and the outer end of the condensation section is provided with a water cooling device.
The utility model has the beneficial effects that:
(1) The evaporation section of the sudden expansion type pulsating heat pipe can store more working fluid, so that the bubble flow range is enlarged, the occurrence of hot spots is reduced, and the pulsating heat pipe is facilitated to perform heat transfer more stably.
(2) The abrupt expansion structure in the abrupt expansion type pulsating heat pipe can increase the speed and the turbulence degree of the working fluid, thereby promoting the mixing of the working fluid and the heat transfer, and improving the heat transfer efficiency.
Drawings
FIG. 1 is a schematic diagram of a prior art single tube pulsating heat pipe structure provided by the present utility model;
fig. 2 is a schematic structural diagram of a sudden expansion pulsating heat pipe provided by the utility model.
Reference numerals in the drawings of the specification include:
1-condensation section, 2-heat insulation section and 3-evaporation section.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model.
As shown in fig. 1 to 2, a sudden expansion type pulsating heat pipe comprises a sealed pipe, the sealed pipe is oval, the sealed pipe is divided into three parts from bottom to top, the evaporation section 3, the heat insulation section 2 and the condensation section 1, the pipe diameter of the sealed pipe of the evaporation section 3 is larger than that of the sealed pipe of the heat insulation section 2, the pipe diameter of the sealed pipe of the heat insulation section 2 is larger than that of the sealed pipe of the condensation section 1, working fluid is filled in the sealed pipe, water is selected as working fluid in the embodiment, the condensation section 1 faces upwards when the sudden expansion type pulsating heat pipe is used, and the evaporation section 3 faces downwards and is vertically placed.
The pipe diameter of the sealed pipeline is calculated according to the surface tension of different working fluids. In the embodiment, the inner diameter of the tube of the evaporation section 3 is 4mm, the inner diameter of the tube of the heat insulation section 2 is 3mm, and the inner diameter of the tube of the condensation section 1 is 2mm. The length of the evaporation section 3, the heat insulation section 2 and the condensation section 1 is 30mm. The utility model relates to a starting operation process and a working principle of a capacity-expansion pulsating heat pipe, which are as follows:
step one: and filling part of working fluid into the vacuumized sealed pipeline pipe, wherein the working fluid forms intermittent distribution of gas-liquid plugs under the action of surface tension.
Step two: the resistance wire is wound outside the evaporation section 3 and electrified to heat, so that the working fluid is heated to become steam, the pressure and the temperature inside the evaporation section are increased, the flow of the working fluid is promoted, the steam is subjected to phase change in the flow, and then a liquid column is formed to flow along a pipeline; the water cooling device is arranged outside the condensing section 1, and cooling water in the water cooling device absorbs heat of steam in the condensing section 1 from the outside to enable the steam to be changed into liquid state again, and meanwhile pressure and temperature inside the condensing section are reduced, so that working fluid is subjected to suction action, and accordingly flows back to the evaporating section along the wall surface of the pipeline.
Step three: along with the heating, the working fluid in the evaporation section of the pulsating heat pipe can boil to generate a large number of bubbles, so that bubble flow is formed, the occurrence of the bubble flow can reduce the operation thermal resistance of the pulsating heat pipe, and the pulsating heat pipe can operate more stably. Compared with the single-tube pulsating heat pipe in the prior art, the evaporation section of the sudden expansion pulsating heat pipe has larger structural area, and increases the occurrence range of bubble flow, thereby improving the heat transfer efficiency of the pulsating heat pipe.
Step four: when working fluid flows from a large pipe diameter to a small pipe diameter, the pressure is reduced, the flow speed is increased, and the heat exchange is enhanced; when the working fluid reaches the sudden expansion structure where the evaporation section and the heat insulation section are connected, and the heat insulation section and the condensation section are connected, the turbulence coefficient is increased, the thickness of the boundary layer is reduced, and the local heat exchange is enhanced due to the existence of the sudden expansion structure.
The utility model applies the sudden expansion pipe diameter to the pulsating heat pipe, the range of bubble flow generated by the evaporation section is larger, and the bubble flow increases the heat transfer surface area of the evaporation section, thereby improving the heat transfer efficiency of the pulsating heat pipe.
Claims (3)
1. The utility model provides a sudden expansion type pulsating heat pipe, its characterized in that, includes sealed pipeline, sealed pipeline be oval, sealed pipeline divide into triplex from the bottom up, evaporation zone, adiabatic section and condensation segment, the sealed pipeline pipe diameter of evaporation zone is greater than the sealed pipeline pipe diameter of adiabatic section, evaporation zone and adiabatic section junction form sudden expansion structure, the sealed pipeline pipe diameter of adiabatic section is greater than the pipe diameter of condensation segment sealed pipeline, adiabatic section and condensation segment junction form sudden expansion structure, the inside working fluid that fills of sealed pipeline.
2. The sudden expansion pulsating heat pipe according to claim 1, wherein the evaporation section, the heat insulation section and the condensation section have the same length.
3. The sudden expansion pulsating heat pipe according to claim 1, wherein the outer end of the evaporation section is wound with a resistance wire, and the outer end of the condensation section is provided with a water cooling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322593161.3U CN220771999U (en) | 2023-09-22 | 2023-09-22 | Sudden expansion type pulsating heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322593161.3U CN220771999U (en) | 2023-09-22 | 2023-09-22 | Sudden expansion type pulsating heat pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220771999U true CN220771999U (en) | 2024-04-12 |
Family
ID=90602927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322593161.3U Active CN220771999U (en) | 2023-09-22 | 2023-09-22 | Sudden expansion type pulsating heat pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220771999U (en) |
-
2023
- 2023-09-22 CN CN202322593161.3U patent/CN220771999U/en active Active
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