CN112648871A - Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core - Google Patents
Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core Download PDFInfo
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- CN112648871A CN112648871A CN202110007408.1A CN202110007408A CN112648871A CN 112648871 A CN112648871 A CN 112648871A CN 202110007408 A CN202110007408 A CN 202110007408A CN 112648871 A CN112648871 A CN 112648871A
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- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000010521 absorption reaction Methods 0.000 title abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 18
- 238000009833 condensation Methods 0.000 claims abstract description 17
- 230000005494 condensation Effects 0.000 claims abstract description 17
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 16
- 238000011049 filling Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 2
- 238000000059 patterning Methods 0.000 claims 2
- 238000013461 design Methods 0.000 abstract description 12
- 238000012546 transfer Methods 0.000 abstract description 12
- 238000011161 development Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 239000002094 self assembled monolayer Substances 0.000 description 1
- 239000013545 self-assembled monolayer Substances 0.000 description 1
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- 230000005514 two-phase flow Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Images
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
- F28D15/04—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 tubes having a capillary structure
- F28D15/046—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 tubes having a capillary structure characterised by the material or the construction of the capillary structure
-
- 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
Landscapes
- 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)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention belongs to the field of phase change heat transfer, and discloses an ultrathin flat heat pipe with a non-uniform wettability patterned liquid absorption core. The inner side surfaces of the bottom plate and the upper cover plate of the flat heat pipe are non-uniform wettability surface patterns which are completely the same and vertically correspond to each other. The surface of the condensation area of the flat heat pipe is provided with a super hydrophilic channel, the surface of the evaporation area of the flat heat pipe is a super hydrophilic area which is communicated with the super hydrophilic transport channel, the liquid in the condensation area is transported to the evaporation area through the super hydrophilic channel, and other areas are super hydrophobic areas or hydrophobic areas. Compared with the traditional flat heat pipe, the invention has the following advantages: the manufacturing method is simple and reliable; the heat conduction resistance is extremely low, the reflux speed of the working medium can be increased, and the heat transfer of a condensation area and an evaporation area is enhanced, so that the heat transfer performance of the ultrathin flat heat pipe is improved; the liquid absorption core is in a patterned design, the ultrathin design and the flexible foldable design of the flat heat pipe can be realized, and the bottleneck problem of the development of the flat heat pipe is solved.
Description
Technical Field
The invention belongs to the field of phase change heat transfer, and particularly relates to an ultrathin flat heat pipe with a patterned liquid absorption core with non-uniform wettability.
Background
With the high-speed development of integrated circuits and the continuous pursuit of people for miniaturized and high-performance electronic products, the integration level of electronic product systems is higher and higher, the running speed of the circuits is increased continuously, and the heat flux density generated by the systems is increased continuously. If the heat cannot be dissipated in time, the electronic equipment can be in a high-temperature environment for a long time, so that the performance is greatly reduced, and the service life is seriously shortened. The flat heat pipe is used as an efficient phase-change heat transfer radiating element, and has the advantages of large heat conductivity coefficient, no need of external power, high heat transfer efficiency, excellent temperature equalizing performance, lightness, convenience, good operation stability and the like, so that the flat heat pipe is widely applied to heat dissipation in the fields of chemical industry, metallurgy, electronic components, energy sources, aviation and the like.
In recent years, the thickness of the flat heat pipe is getting thinner, and the ultra-thin flat heat pipe becomes an ideal choice for realizing quick and effective heat dissipation of electronic components. The liquid absorption core is used as a channel for two-phase flow in the ultrathin heat pipe and a driving force source, and has great influence on the heat transfer and mass transfer process. The traditional sintered wick can provide larger capillary pressure and good evaporation heat transfer performance, but the permeability and the heat conduction performance are poorer; while grooved wicks have higher permeability and thermal conductivity, but have lower capillary pressure. Therefore, the wetting property of the surface needs to be considered to break through the bottleneck limiting the development of the flat heat pipe. A super-hydrophilic/super-hydrophobic matching ultrathin heat pipe (Liuchangquan, xucheng, a well-entrenched soldier) with the thickness of 1.30mm is developed in Liuchangquan, etc., the heat transfer characteristic of the super-hydrophilic/super-hydrophobic matching ultrathin heat pipe is [ J ]. the chemical engineering progress, 2018,37(06):2067 and 2076.), a chemical method is used for carrying out modification treatment on a liquid absorption core and a condensation surface, the matching of super-hydrophilic and super-hydrophobic in the heat pipe is realized, and the heat exchange performance of the heat pipe is improved.
In addition, the development of new electronic industry is turning to curved surface, folding, and flexibility, and the matched heat dissipation element is required to have not only higher thermal conductivity and small volume, but also excellent flexibility. However, most of the flat heat pipes are rigid structures, and have the defects that the flat heat pipes cannot be bent or the internal structures of the flat heat pipes are changed after the flat heat pipes are bent, so that the heat transfer coefficient is easily and rapidly reduced. The smith of Nanjing aerospace university and the like utilize a flexible copper wire mesh to invent an ultrathin flexible flat heat pipe (publication number CN 211012603), so that the flexible design of the flat heat pipe is realized, but the traditional wire mesh liquid absorption core still has the problems of large heat conduction resistance, large backflow resistance, large occupied space and the like.
In view of the defects of the conventional flat heat pipe and the development trend of the electronic heat dissipation field, the invention provides an ultrathin flat heat pipe with a non-uniform wettability patterned wick.
Disclosure of Invention
The invention provides an ultrathin flat heat pipe with a patterned liquid absorption core with non-uniform wettability. The invention enables the flat heat pipe liquid absorption core to have the advantages of large capillary pressure and high permeability at the same time; the non-uniform wettability patterned liquid absorption core has no thickness, so that the thickness of the flat heat pipe can be greatly reduced; the super-hydrophilic-super-hydrophobic/hydrophobic pattern design of the condensation area is favorable for strengthening condensation heat exchange, and meanwhile, the super-hydrophilic pattern design of the evaporation section is also favorable for enhancing heat exchange efficiency; the transport channel with the super-hydrophilic-super-hydrophobic/hydrophobic structure can greatly improve the reflux rate of the liquid medium. Therefore, the patterned liquid absorption core ultrathin flat heat pipe with the non-uniform wettability can improve the heat transfer performance of the flat heat pipe and can realize the ultrathin design and the flexible foldable design of the flat heat pipe.
The technical scheme of the invention is as follows:
an ultrathin flat heat pipe with a non-uniform wettability patterned wick comprises an upper cover plate 1 with a non-uniform wettability pattern, a bottom plate 5 which is completely identical with the non-uniform wettability pattern of the upper cover plate, supporting columns 3 between the upper cover plate 1 and the bottom plate 5 and a liquid filling pipe 4, wherein:
the bottom plate 5 is provided with a groove 2, and the non-uniform wettability pattern is positioned in the groove 2;
the supporting columns 3 are fixed in the grooves 2, so that a certain gap is formed between the upper cover plate 1 and the bottom plate 5 and serves as a cavity for flowing of steam and liquid working media;
the liquid charging pipe 4 is arranged on the bottom plate 5 and is communicated with the groove 2, so that the liquid charging pipe is communicated with the outside and a cavity between the flat heat pipe for vacuumizing and charging liquid;
the non-uniform wettability pattern comprises a super-hydrophilic channel and a super-hydrophilic evaporation area, and other areas are super-hydrophobic areas or hydrophobic areas 9; the super-hydrophilic channel is divided into a main channel 6 and a plurality of secondary channels 7 which are communicated with each other; the main channel 6 is communicated with the super-hydrophilic evaporation area 8; each super-hydrophilic channel extends from the condensation area 10 to the super-hydrophilic evaporation area 8, so that steam in the condensation area 10 is dripped and condensed in the super-hydrophobic area or the hydrophobic area 9, moves from the super-hydrophobic area or the hydrophobic area 9 to the super-hydrophilic channel by using surface tension, and then flows to the super-hydrophilic evaporation area 8 under the action of laplace pressure, capillary force and surface tension.
Wherein the support column 3 is positioned on the super-hydrophobic area or hydrophobic area 9 on the non-uniform wettability pattern, and is connected with the upper cover plate 1 and the bottom plate 5;
wherein the rectangular portion at the center of the non-uniform wettability pattern in the groove 2 is the super-hydrophilic evaporation zone 8, and the rest is the condensation zone 10, as shown in fig. 4.
The steam flows from the super-hydrophilic evaporation area 8 to the condensation area 10 in the cavity above the super-hydrophobic area or the hydrophobic area 9, and the liquid flows back to the super-hydrophilic evaporation area 8 along the condensation area 10 in the super-hydrophilic channel.
The shape of the main channel and the secondary channel of the super-hydrophilic channel is triangular, wedge-shaped or strip-shaped.
The cavity clearance between upper cover plate and the bottom plate is 10 ~ 3000 microns.
The upper cover plate, the bottom plate and the support columns are made of flexible foldable materials, so that the flexible flat heat pipe is manufactured, and the liquid absorption capacity of the liquid absorption core is not influenced.
Wherein, super hydrophilic means static contact angle is less than 10 degrees, hydrophobic means static contact angle is more than 90 degrees, and super hydrophobic means static contact angle is more than 150 degrees.
The non-uniform wettability pattern can be designed into different patterns according to the requirements of different flat heat pipes, the wedge angle 12 of the super-hydrophilic triangular or wedge-shaped channel is not more than 8 degrees, and the speed and distance of fluid transportation are regulated and controlled by regulating and controlling the size of the wedge angle 12; the shape and number of the super hydrophilic channels can also be adjusted.
And the liquid filling pipe 4 is used for communicating the cavity in the flat heat pipe with the outside for vacuumizing and filling liquid, and the cavity is sealed after the filling liquid is finished.
The invention has the beneficial effects that:
(1) the patterned liquid absorption core with the non-uniform wettability has the advantages of high capillary pressure and high permeability;
(2) the non-uniform wettability patterned liquid absorption core has no thickness, so that the thickness of the flat heat pipe can be greatly reduced;
(3) the super-hydrophilic-super-hydrophobic/hydrophobic pattern design of the condensation area is favorable for strengthening condensation heat exchange, and meanwhile, the super-hydrophilic pattern design of the evaporation section is also favorable for enhancing heat exchange efficiency;
(4) the transport channel with the super-hydrophilic-super-hydrophobic/hydrophobic structure can greatly improve the reflux rate of the liquid medium.
(5) The non-uniform wettability patterned wick is not a rigid structure, and can realize flexible, ultrathin and foldable design of the flat heat pipe.
(6) The manufacturing method of the ultrathin heat pipe with the non-uniform-wettability patterned liquid absorption core is simple and reliable, can be applied to industrial production in a large scale, and solves the bottleneck problem of development of flat heat pipes.
Drawings
FIG. 1 is a schematic diagram of a non-uniform wettability patterned wick ultra-thin flat plate heat pipe;
FIG. 2 is a schematic view of a non-uniform wettability pattern of the surfaces of the upper and lower plates;
FIG. 3 is an enlarged view of a single superhydrophilic channel on a non-uniform wettability pattern;
FIG. 4 is a schematic view of a non-uniform wettability pattern zoning for the upper plate and the base plate surfaces;
FIG. 5 is a schematic view of a bobbin structure of the base plate;
FIG. 6 is a schematic diagram of a general bobbin structure of a flat heat pipe;
in the figure: 1, an upper cover plate; 2, grooves; 3, supporting columns; 4, filling a liquid pipe; 5, a bottom plate; 6 a main channel; 7 times of channels; 8, a super-hydrophilic evaporation area; 9 a superhydrophobic region or hydrophobic region; 10 a condensation zone; 11 liquid filling holes; a wedge angle of 12.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
In order that the invention may be readily understood, a more particular description of the invention briefly described below will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It is to be understood that these features and embodiments are described merely to further illustrate the features and advantages of the invention, and are not intended to limit the scope of the claims.
Example 1:
(1) firstly, an upper cover plate 1, a bottom plate 5 and a supporting column 3 are machined by mirror aluminum through a machining method, and a liquid filling pipe 4 is welded on a liquid filling hole 11 of the bottom plate through a welding technology.
(2) Preparation of a composition comprising hydrophobic fluoroacrylic copolymer, TiO2A dispersion of nanoparticles and ethanol. First 1.5g of TiO2Addition to 14g of ethanol to form TiO2And ethanol, then sonicated by running a probe. Then, 2.5g of a fluoroacrylic copolymer solution was added and mechanically shaken at room temperature to form a stable dispersion.
(3) The above solution was sprayed onto specular aluminum using a spray gun to form a uniform coating. The sprayed samples were then dried in a preheated oven at 60 ℃ for 4 hours to finally form a superhydrophobic surface.
(4) A superhydrophilic pattern is formed on the superhydrophobic surface by selectively exposing the coated substrate to ultraviolet radiation using a photomask. The uv light passes through the transparent portion of the mask and impinges on the coated superhydrophobic substrate. Compound medicineTiO in composite material2The presence of (b) promotes photocatalytic conversion of the exposed areas, rendering them superhydrophilic. A wick design with a non-uniform wettability pattern was obtained using this uv-mask technique.
(5) The upper cover plate and the bottom plate made of the mirror aluminum material are welded together by a welding technology, and the ultrathin flat heat pipe is manufactured.
Example 2:
(1) firstly, an upper cover plate 1, a bottom plate 5 and a supporting column 3 are machined by mirror aluminum through a machining method, and a liquid filling pipe 4 is welded on a liquid filling hole 11 of the bottom plate through a welding technology.
(2) The aluminum sample was immersed in 0.5M NaOH at room temperature to remove the oxide layer and oil on its surface, and then its surface was etched in 1M HCl solution at 80 ℃ for 2 minutes to form a micro-scale structure. The aluminum sample with the microstructured surface was immersed in a NaOH solution (0.5M, room temperature) for 10 seconds to form nano-scale structures on the surface.
(3) The aluminum samples were allowed to soak for 5 minutes in deionized water at 95 ℃ to stabilize. The layered structure surface of the aluminum sample was then coated with a self-assembled monolayer of heptafluoro-1, 1,2, 2-tetrahydrodecyltrichlorosilane. The aluminum samples were immersed in a solution of heptafluoro-1, 1,2, 2-tetrahydrodecyltrichlorosilane containing n-hexane (1000: 1 by volume) for 10 minutes, and then the samples were washed with deionized water and dried in an oven. Baking at 105 deg.C for 1 hr. The coated sample exhibited superhydrophobicity with a water contact angle of 164.4 °.
(4) The superhydrophobic surface is patterned by laser processing, and the basic aluminum surface is subjected to laser irradiation to melt the surface and form a new nano structure. In addition, the C-F bond in the fluoroalkyl group disappears at 500 ℃, resulting in loss of hydrophobicity, thereby forming a superhydrophilic region.
(5) And welding the upper cover plate and the bottom plate which are made of aluminum materials together by a welding technology to manufacture the ultrathin flat heat pipe with the non-uniform wettability pattern liquid absorption core.
The invention and the advantages of the present disclosure have been described in detail with reference to the specific examples, it should be understood that the description is only for the purpose of illustration and not as a definition of the limits of the invention. The size and shape of the elements in the figure do not reflect the actual size and scale, and the non-uniform wettability pattern in the figure does not reflect a fixed pattern, but merely represents the content of the present example. Any modification, improvement or equivalent replacement made on the principle and spirit of the present disclosure is within the protection scope of the present disclosure.
Claims (6)
1. The utility model provides an ultra-thin flat plate heat pipe of non-uniform wettability patterning wick which characterized in that, this ultra-thin flat plate heat pipe of non-uniform wettability patterning wick includes the upper cover plate that has non-uniform wettability pattern, the bottom plate exactly the same with the non-uniform wettability pattern of upper cover plate, support column and the liquid charging pipe between upper cover plate and the bottom plate, wherein:
the bottom plate is provided with a groove, and the non-uniform wettability pattern is positioned in the groove;
the supporting columns are fixed in the grooves, so that a certain gap is formed between the upper cover plate and the bottom plate and serves as a cavity for flowing of steam and liquid working media;
the liquid filling pipe is arranged on the bottom plate and communicated with the groove, so that the liquid filling pipe is communicated with the outside and a cavity between the flat heat pipe for vacuumizing and filling liquid;
the non-uniform wettability pattern comprises a super-hydrophilic channel and a super-hydrophilic evaporation area, and other areas are super-hydrophobic areas or hydrophobic areas; the super-hydrophilic channel is divided into a main channel and a plurality of secondary channels which are communicated with each other; the main channel is communicated with the super-hydrophilic evaporation area; each super-hydrophilic channel extends from the condensation section to the super-hydrophilic evaporation area, so that steam in the condensation section moves to the super-hydrophilic channel from the super-hydrophobic area or the hydrophobic area by utilizing surface tension after being subjected to dropwise condensation in the super-hydrophobic area or the hydrophobic area, and then flows to the super-hydrophilic evaporation area under the actions of Laplace pressure, capillary force and surface tension.
2. The ultra-thin flat plate heat pipe with non-uniform wettability patterned wick according to claim 1, wherein the primary and secondary channels of the superhydrophilic channel are triangular, wedge-shaped, or strip-shaped.
3. A non-uniform wettability patterned wick ultra-thin flat plate heat pipe according to claim 2, wherein the wedge angle of the superhydrophilic triangular or wedge-shaped channel is no greater than 8 degrees.
4. The ultrathin flat heat pipe with a non-uniform wettability patterned wick according to any one of claims 1 to 3, wherein the cavity gap between the upper cover plate and the base plate is 10 to 3000 microns.
5. A non-uniform wettability patterned wick ultra-thin flat plate heat pipe according to any one of claims 1 to 3, wherein the upper cover plate, the base plate and the support posts are of flexible and foldable material.
6. The ultra-thin flat plate heat pipe with non-uniform wettability patterned wick according to claim 4, wherein the upper cover plate, the base plate, and the support posts are made of a flexible and foldable material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110007408.1A CN112648871A (en) | 2021-01-05 | 2021-01-05 | Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110007408.1A CN112648871A (en) | 2021-01-05 | 2021-01-05 | Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core |
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| CN112648871A true CN112648871A (en) | 2021-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295027A (en) * | 2021-06-01 | 2021-08-24 | 广东工业大学 | Self-refluxing flat heat pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130308277A1 (en) * | 2012-05-15 | 2013-11-21 | Toyota Motor Engineering & Manufacturing North America, Inc. | Two-phase heat transfer assemblies and power electronics modules incorporating the same |
| CN108444324A (en) * | 2018-06-22 | 2018-08-24 | 广东工业大学 | A kind of soaking plate |
| CN109539846A (en) * | 2018-11-23 | 2019-03-29 | 西安交通大学 | A kind of flat-plate heat pipe with gradient wetting structure |
| CN112077547A (en) * | 2020-08-03 | 2020-12-15 | 东莞领杰金属精密制造科技有限公司 | Soaking plate structure without liquid absorption core and preparation method thereof |
| CN112144608A (en) * | 2020-08-12 | 2020-12-29 | 江苏大学 | Bionic blade integrating self-transportation and permeation of water absorption |
| CN214276626U (en) * | 2021-01-05 | 2021-09-24 | 大连理工大学 | Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core |
-
2021
- 2021-01-05 CN CN202110007408.1A patent/CN112648871A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130308277A1 (en) * | 2012-05-15 | 2013-11-21 | Toyota Motor Engineering & Manufacturing North America, Inc. | Two-phase heat transfer assemblies and power electronics modules incorporating the same |
| CN108444324A (en) * | 2018-06-22 | 2018-08-24 | 广东工业大学 | A kind of soaking plate |
| CN109539846A (en) * | 2018-11-23 | 2019-03-29 | 西安交通大学 | A kind of flat-plate heat pipe with gradient wetting structure |
| CN112077547A (en) * | 2020-08-03 | 2020-12-15 | 东莞领杰金属精密制造科技有限公司 | Soaking plate structure without liquid absorption core and preparation method thereof |
| CN112144608A (en) * | 2020-08-12 | 2020-12-29 | 江苏大学 | Bionic blade integrating self-transportation and permeation of water absorption |
| CN214276626U (en) * | 2021-01-05 | 2021-09-24 | 大连理工大学 | Ultrathin flat heat pipe with non-uniform wettability patterned liquid absorption core |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295027A (en) * | 2021-06-01 | 2021-08-24 | 广东工业大学 | Self-refluxing flat heat pipe |
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