CN112229234A - Bionic condensation enhanced heat transfer surface - Google Patents
Bionic condensation enhanced heat transfer surface Download PDFInfo
- Publication number
- CN112229234A CN112229234A CN202011099346.3A CN202011099346A CN112229234A CN 112229234 A CN112229234 A CN 112229234A CN 202011099346 A CN202011099346 A CN 202011099346A CN 112229234 A CN112229234 A CN 112229234A
- Authority
- CN
- China
- Prior art keywords
- condensation
- hydrophilic
- heat transfer
- nucleation
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
- F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- 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
Abstract
The invention discloses a bionic condensation enhanced heat transfer surface, which comprises: a substrate, a microchannel, and a hydrophilic nucleation site; the substrate has hydrophobicity; the microchannels are dispersed on the substrate along the radial direction of a circle center at the same circle center angle, wherein the circle center is positioned on the substrate or not; the hydrophilic nucleation points are distributed on the substrate; the width between adjacent microchannels increases in a gradient along the length. The condensation heat transfer surface utilizes the surface free energy gradient to generate driving force for condensation liquid drops, accelerates the liquid discharge of the condensation surface, accelerates the nucleation of the condensation liquid drops on the condensation surface by utilizing hydrophilic nucleation points distributed on the surface of the hydrophobic substrate, forms a more stable bead-shaped condensation process on the condensation surface and ensures the smooth proceeding of condensation circulation. The condensation enhanced heat transfer surface can effectively improve the nucleation and update rate of condensation liquid drops, ensure the continuous and stable bead-shaped condensation behavior and enhance the condensation phase change heat transfer performance.
Description
Technical Field
The invention relates to a condensation enhanced heat transfer surface, in particular to a condensation surface which is designed for improving the nucleation and the updating rate of condensation liquid drops, keeping the beaded condensation of the surface and realizing high-efficiency heat exchange and has the characteristics of artificial nucleation sites and surface gradient grooves and can effectively enhance the condensation heat transfer.
Background
With the rapid development of electronic information technology and micro-electro-mechanical systems (MEMS), electronic devices are developed toward miniaturization, integration, and high power. The challenge of efficient heat dissipation with high heat flux density in small scale spaces is becoming more severe due to the reduction in physical size and the increase in equipment capacity. The design and development of the efficient condensation heat transfer surface are beneficial to solving the technical problem of small-scale space high heat flux density heat dissipation in the development process of high and new technologies such as portable electronic devices, high-power electronic equipment and new energy electric vehicles.
The condensation behavior of heat transfer surfaces is generally divided into film-like condensation and bead-like condensation. When the film-shaped condensation occurs, the condensate forms a layer of continuous liquid film on the hydrophilic metal surface, and the existence of the continuous liquid film greatly increases the heat transfer resistance between steam and the metal surface, thereby hindering the efficient transmission of heat in the gas-liquid phase change process. Compared with film-shaped condensation, bead-shaped condensation usually exists on a hydrophobic surface, a continuous liquid film does not exist in the condensation process, steam is in direct contact with the surface, the thermal resistance is effectively reduced, the hydrophobic surface is easier to remove condensed liquid drops, and the heat transfer performance in the condensation process is greatly improved. Current research has shown that bead condensation has an order of magnitude higher heat transfer coefficient than film condensation.
At present, the traditional hydrophobic surface construction method is generally to chemically modify hydrophobic groups on the condensation surface, and the groups are helpful to realize bead condensation. However, a reduction in the surface energy of the chemically modified condensation surface leads to increased difficulty in droplet nucleation; condensed liquid drops on the homogeneous hydrophobic surface are randomly distributed, and efficient fusion and self-renewal of the liquid drops are not facilitated; the condensed liquid drops are also driven to be separated by gravity, the update rate is slow, and the thermal resistance is still high. Therefore, the reasonable design of the metal surface structure is urgently needed, the nucleation density of the condensed liquid drops is increased, and meanwhile, the updating rate of the condensed liquid drops is increased, so that the heat transfer efficiency is greatly improved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bionic enhanced condensation heat transfer surface aiming at the defects of the prior art. The heat transfer surface simulates and combines the water collection process of the nano-budworm and the cactus palmaris, and has the nucleation sites and the surface free energy gradient of the condensation liquid drops, thereby accelerating the nucleation rate and the updating rate of the condensation liquid drops on the condensation surface, greatly improving the condensation heat exchange coefficient of the condensation surface, and effectively strengthening the transportation of gas-liquid phase change heat energy in the condensation process.
In order to solve the technical problems existing in the traditional condensation surface design, the technical scheme provided by the invention is as follows:
a bionic condensation enhanced heat transfer surface is composed of a substrate, microgrooves and hydrophilic nucleation points, wherein the substrate has hydrophobicity, the microgrooves have hydrophobicity and are uniformly dispersed on the substrate along the radial direction, and the hydrophilic nucleation points are distributed on the substrate, and the bionic condensation enhanced heat transfer surface is characterized in that: the cross section of the micro-channel is triangular or inverted trapezoidal, and the sectional area of the micro-channel is increased in a gradient manner along the length direction; the interval between the adjacent microchannels is less than or equal to the width of the adjacent hydrophobic microchannels, and the width is increased in a gradient manner along the length direction; the distribution density of the hydrophilic nucleation points is increased along the increasing direction of the cross-sectional area of the microchannel.
The width of the microchannels can vary from 1 μm to 1mm, and the maximum length of each microchannel does not exceed 100 mm. Since the width of the microchannels is gradually changed, the interval between adjacent microchannels is also gradually changed, so that the surface free energy of the heat exchange surface is changed in a gradient along the length direction of the microchannels. The wider the width of the microchannel, the greater the surface free energy, thereby creating a driving force on the heat transfer surface to move the condensate droplets in the direction of the greater surface free energy, causing the condensate droplets of the heat transfer surface to be expelled from the widest side of the microchannel. The micro-channels accelerate the liquid discharge process of the heat transfer surface, accelerate the renewal of condensed liquid drops on the heat transfer surface, prevent a large amount of condensed liquid drops from being retained on the heat transfer surface and forming a liquid film, keep the bead-shaped condensation of the heat transfer surface and increase the condensation heat transfer coefficient.
The hydrophilic nucleation points are circular in shape, the diameter of the hydrophilic nucleation points is 5-15 mu m, and the distance between every two hydrophilic nucleation points is 20-100 mu m. And a plurality of hydrophilic nucleation points distributed on the micro-channels with the same width form an artificial hydrophilic nucleation array. And hydrophilic nucleating points in the same artificial hydrophilic nucleating array are uniformly distributed, and the distribution density is gradually increased along the direction that the width of the microchannel is increased. The existence of the hydrophilic nucleation sites increases the surface free energy of the substrate, and the surface free energy is also greater at positions where the hydrophilic nucleation sites are distributed at a high density.
The surface free energy of the hydrophilic nucleation sites is greater than that of the hydrophobic substrate, and condensed liquid drops preferentially nucleate and grow rapidly at the hydrophilic nucleation sites. After a certain time, the long condensed liquid drops on the adjacent hydrophilic nucleation points are fused with each other to form a larger liquid drop and cover the plurality of hydrophobic microchannels and the plurality of hydrophilic nucleation points. The micro-channel cross-sectional area gradient change and the hydrophilic nucleation point distribution density directional change generate surface free energy along the radial direction, and condensate droplets driving the heat transfer surface are separated from the heat exchange surface along the radial direction, so that the liquid discharge process of the condensate droplets on the heat transfer heat exchange surface is accelerated, the condensate droplets on the heat transfer heat exchange surface are prevented from being gathered to form a liquid film, and the heat transfer heat exchange surface is kept in a beaded condensation heat exchange mode.
When the included angle between the direction of the width of the micro-channel on the heat transfer surface and the direction of gravity is smaller than 90 degrees, gravity can also be used as one of driving forces for draining condensed liquid drops on the heat transfer surface, the liquid drainage speed of the heat transfer surface is accelerated, and the condensation heat exchange effect is better.
The substrate is rendered hydrophobic by a hydrophobic treatment. Because the surface free energy of the hydrophobic substrate is low, liquid drops are not easy to spread on the surface, favorable conditions are provided for bead condensation, and the heat exchange coefficient of condensation heat exchange is increased. The hydrophobic substrate can be round, rectangular, circular and the like, a plane or curved surface structure can be selected according to actual application conditions, and materials such as copper, aluminum, stainless steel, alloy and the like can be selected.
The hydrophobic treatment method comprises chemical modification of fluorosilane, chemical vapor deposition and other methods, and the hydrophilic treatment method comprises plasma treatment, laser cutting and other methods.
The invention relates to a bionic enhanced condensation heat transfer surface with hydrophobic microchannels with gradient change in cross-sectional area and hydrophilic nucleation points with directionally changed distribution density, which is designed based on the inspiration of a special hydrophilic-hydrophobic composite surface on the back of a palm prick surface gradient channel structure of a cactus and a nano-class beetle. The condensation surface can generate directional surface free energy gradient, so that the updating of condensation liquid drops on the condensation surface is accelerated, meanwhile, the nucleation rate of the condensation liquid drops is increased due to the existence of hydrophilic nucleation points, and the transportation of gas-liquid phase change heat energy in the condensation process is effectively enhanced.
Advantageous effects
The invention discloses a bionic condensation enhanced heat transfer surface, wherein a hydrophobic micro-channel structure with gradient change in cross-sectional area and a hydrophilic nucleation point structure with directional change in distribution density generate surface free energy gradient on the heat transfer surface, so that condensed liquid drops on the heat transfer surface generate a driving force towards a direction with larger surface free energy, the liquid drops cannot be stabilized on the condensation surface, the liquid drainage process of the heat transfer surface is accelerated, and the proceeding of a beaded condensation process of the heat transfer surface is ensured. Furthermore, the multiple hydrophilic nucleation site structure on the heat transfer surface reduces the nucleation energy barrier of the condensed droplets on the heat transfer surface, increasing the nucleation density of the condensed droplets. The heat transfer surface can strengthen the nucleation of condensed liquid drops, accelerate the discharge of the condensed liquid drops and keep the condensation of beads, thereby improving the efficiency of condensation heat exchange.
Drawings
FIG. 1 is a schematic view of the configuration of a condensing heat transfer surface of the present invention.
Fig. 2 is a schematic diagram of embodiment 1 of the present invention.
FIG. 3 is a schematic view of droplet movement of a condensing heat transfer surface.
Fig. 4 is a schematic diagram of embodiment 2 of the present invention.
The figure shows that: 1. a hydrophobic substrate; 2. a hydrophobic microchannel; 3. a hydrophilic nucleation site; 4. a circular condensing surface; 5. condensing the droplets of the heat transfer surface; 6. a rectangular condensing heat transfer surface.
Detailed Description
The following is a more detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a bionic condensation-enhanced heat transfer surface, which is composed of hydrophobic microchannels 2 and hydrophilic nucleation points 3 distributed on a hydrophobic substrate 1.
The hydrophobic microchannels 2 are processed on the hydrophobic substrate 1, the cross section is in the shape of a regular triangle, and the cross section area is changed in a gradient mode along the length direction, so that in order to enable condensed liquid drops to cover more hydrophobic microchannels 2 and generate larger driving force to enable the liquid drops to move, the interval between every two adjacent hydrophobic microchannels 2 is smaller than or equal to the width of every two adjacent hydrophobic microchannels 2. The width of the hydrophobic microchannels 2 may vary from 1 μm to 1mm and the maximum length of each hydrophobic microchannel 2 does not exceed 100 mm. After the hydrophobic microchannels 2 are processed, the hydrophobic substrate 1 and the hydrophobic microchannels 2 are subjected to hydrophobic modification to obtain a condensation heat transfer surface which is hydrophobic as a whole and is provided with the hydrophobic microchannels 2, and then hydrophilic nucleation points 3 can be processed on the heat transfer surface. The hydrophobic substrate and the hydrophobic micro-channel with hydrophobic surfaces enable the liquid drop not to spread easily on the condensation surface, prevent the liquid drop from spreading and aggregating into a liquid film in a large amount, and provide favorable conditions for the condensation of the beads.
The surface of the hydrophilic nucleation points 3 is a hydrophilic surface after being treated, the shape is circular, the diameter is 5-15 μm, the distance between every two hydrophilic nucleation points 3 is 20-100 μm, the distribution density of the hydrophilic nucleation points 3 is changed along the length direction of the hydrophobic microchannels 2, a plurality of hydrophilic nucleation points 3 distributed at the positions of the hydrophobic microchannels 2 with the same width form a hydrophilic nucleation column, the hydrophilic nucleation points 3 in the same hydrophilic nucleation column are uniformly distributed, and the distribution density of the hydrophilic nucleation points 3 is gradually increased along the direction of increasing the width of the hydrophobic microchannels 2. Due to the large surface free energy of the hydrophilic nucleation sites 3, the condensed droplets will preferentially nucleate and grow rapidly on the surface of the hydrophilic nucleation sites 3. The combination of the hydrophobic micro-channel 2 structure and the hydrophilic nucleation point 3 structure on the condensation surface generates gradually increased surface free energy along the width increasing direction of the hydrophobic micro-channel 2 on the condensation surface, provides driving force for the condensation liquid drops on the condensation surface to separate from the condensation surface, and accelerates the liquid discharge on the condensation surface.
Example 1:
as shown in fig. 2, is a top view of a horizontally placed circular condensation surface 4 and one condensation droplet 5 on the circular condensation surface. The cross-sectional area of the hydrophobic microchannels distributed on the circular condensation surface 4 becomes gradually larger in the radial direction, and the distribution density of hydrophilic nucleation sites on the circular condensation surface 4 becomes larger in the direction in which the width of the hydrophobic microchannels becomes larger as shown in fig. 2. As shown in fig. 2, if the area of the region covered with the condensed liquid droplets 5 is divided into two in the direction perpendicular to the radial direction, the number of hydrophilic nucleation sites in the covered region on the side close to the center of the circle is smaller than the number of hydrophilic nucleation sites in the other side region. As the surface free energy of the round condensation surface 4 is increased along the direction of increasing the width of the hydrophobic micro-channel, a driving force towards the direction of increasing the surface free energy is generated for the condensation liquid drops 5 positioned on the round condensation surface 4, so that the condensation liquid drops 5 move towards the direction far away from the circle center, and finally the condensation liquid drops 5 move to the outermost edge of the round condensation surface 4 and are discharged from the condensation surface.
The principle of the condensation surface generating a driving force for moving the condensed liquid droplets is explained below by taking the circular condensation surface 4 shown in fig. 2 as an example:
1. driving force due to gradient change of cross-sectional area of hydrophobic microchannel
Fig. 3 is a schematic diagram of the movement of the condensate droplets on the condensation surface with a gradient of cross-sectional area, illustrating the force exerted by the condensate droplets on the surface of the condensation plate. The dashed arrows indicate the direction from the narrow channel to the wide channel, and in the case of the circular condensation surface 4 shown in fig. 2, the dashed arrows indicate the direction from the center of the circle to the circumference.
The ratio of the surface area of a real solid to the apparent area is defined as the surface roughness ratio r, which has a significant effect on the actual contact angle, which can be described by the Wenzel model:
cosθ*＝r cosθ (1)
wherein theta is*For apparent contact angle, θ is the ideal contact angle.
The apparent roughness ratio r is greater at the narrower portions of the hydrophobic microchannels at the condensation heat transfer surface where the cross-sectional area of the hydrophobic microchannels varies in a gradient manner. Let the surface roughness ratios at the contact of the condensed liquid droplets and the condensing surface shown in FIG. 3 be r, respectively1，r2Then r is1>r2. Cos θ due to the hydrophobic surface of the condensing surface<0, cos θ is known from the formula (1)1 *<cosθ2 *So that theta1 *>θ2 *. I.e., more hydrophobic (less surface free energy) at locations where the cross-sectional area of the hydrophobic microchannels is smaller on the condensing surface, and less hydrophobic (more surface free energy) at locations where the cross-sectional area of the hydrophobic microchannels is larger. Therefore, a wettability gradient, i.e. a surface free energy gradient, exists on the condensation surface where the gradient of the cross-sectional area of the hydrophobic microchannel changes, and the condensation liquid drop on such a surface generates a resultant force, i.e. a driving force, in the direction of the increase of the surface free energy due to the unbalanced surface tension. Since the surface tension of the solid surface having less hydrophobicity is larger than that of the surface having greater hydrophobicity, the droplet always moves to a position having less hydrophobicity. Taking the circular condensation surface 4 shown in fig. 2 as an example, the condensation droplets 5 will move away from the center of the circle under the driving of the surface free energy gradient.
2. Driving force due to directional change of distribution density of hydrophilic nucleation sites
The distribution density of hydrophilic nucleation sites 3 on a circular condensation surface 4 as shown in fig. 2 becomes greater in the direction in which the cross-sectional area of the hydrophobic microchannels 2 becomes greater. Fig. 2 shows only the distribution of hydrophilic nucleation sites, and the number of hydrophilic nucleation sites on the actual condensation surface is greater than that shown, and each droplet on the condensation surface will cover a plurality of hydrophilic nucleation sites. It is demonstrated below that the directional change in density of distribution of hydrophilic nucleation sites can drive the movement of droplets on the condensation surface.
It is now assumed that the circular condensation surface 4 shown in FIG. 2 is flat and has hydrophilic nucleation sites3, and assuming that only one condensed liquid drop 5 exists on the circular condensing surface, the coverage area of the condensed liquid drop 5 is A, and the area ratio of the hydrophilic area to the hydrophobic area under the coverage area of the condensed liquid drop 5 is
a is the total area of the hydrophobic areas of the circular condensation surface 4 and b is the total area of the hydrophilic areas of the circular condensation surface 4. The surface free energy of the system is calculated by taking the circular condensation surface 4 and the condensation droplets 5 as a system.
Namely, it is
Wherein gamma issv，γslRespectively, the surface tension between the hydrophobic surface and the gas phase, and the surface tension between the hydrophobic surface and the liquid phase. Gamma raysv′，γsl' surface tension between the surface of the hydrophilic nucleation site and the gas phase, and surface tension between the surface of the hydrophilic nucleation site and the liquid phase, respectively. Gamma raylvIs the surface tension between the liquid and gas phases.
Formula (3) shows the total surface free energy G of the system.
According to Young's equation, the contact angles theta and gamma can be knownsv，γsl，γlvThe relationship between:
and since the contact angle theta of the hydrophobic surface is larger than the contact angle theta' of the hydrophilic nucleation site surface, it can be obtained that:
cosθ＜cosθ′ (5)
namely, it is
Therefore, it is not only easy to use
(γsv-γsl)-(γsv′-γsl′)＜0 (7)
As can be seen from the analysis formula (3), when the droplet covers the area, the ratio of the area of the hydrophilic region to the area of the hydrophobic region
Increasing, the total surface free energy G of the system will decrease. On the principle of energy minimization, in order to change the total surface free energy of the system in a decreasing direction, the condensation droplets 5 on the circular condensation surface 4 of fig. 2 will be oriented in such a way that
The increasing direction, i.e. the condensate droplets 5 will move away from the centre of the circle.
The gradient of the free energy of the surface generated by the gradient change of the cross section area of the hydrophobic microchannels 2 and the directional change of the distribution density of the hydrophilic nucleation points 3 drives the condensed liquid drops 5 to move away from the center of the circle. The condensation liquid drops can not be stabilized on the condensation surface under the combined action of the surface free energy gradient generated by the two principles, so that the liquid drainage process of the condensation surface is accelerated, the condensation liquid drops on the condensation surface are prevented from gathering to form a liquid film, and the condensation surface is kept in a beaded condensation heat exchange mode.
Example 2:
as shown in fig. 4, a rectangular condensation surface 6.
The hydrophobic microchannels 2 distributed on the rectangular condensation surface 6 are distributed in a manner such that the cross-sectional area varies in a gradient along the length of the hydrophobic microchannels, and the interval between every two adjacent hydrophobic microchannels is identical to the width of the two adjacent hydrophobic microchannels, as shown in fig. 4.
The hydrophilic nucleation sites 3 distributed on the rectangular condensation surface 6 are distributed in a pattern such that the hydrophilic nucleation sites 3 are hydrophilic surfaces and have a circular shape, as shown in fig. 4. The plurality of hydrophilic nucleation sites distributed at the positions of the hydrophobic microchannels 2 with the same width form an artificial hydrophilic nucleation column, the hydrophilic nucleation sites 3 in the same artificial hydrophilic nucleation column are uniformly distributed, and the distribution density of the hydrophilic nucleation sites 3 is gradually increased along the direction in which the width of the hydrophobic microchannels 2 is increased.
According to the actual use condition demand, the rectangular condensation surface 6 shown in fig. 4 can be placed in the included angle range of-90 degrees to 90 degrees between the x axis shown and the vertical downward direction, so that the included angle between the width increasing direction of all the hydrophobic micro-channels on the condensation surface and the gravity direction is smaller than 90 degrees, the gravity is also used as one of the driving forces of condensate liquid drop liquid drainage, the liquid drainage speed of the condensation surface is accelerated, and the condensation heat exchange effect is better.
Claims (7)
1. A biomimetic condensation enhanced heat transfer surface, comprising: a substrate, a microchannel, and a hydrophilic nucleation site; the substrate has hydrophobicity; the microchannels are dispersed on the substrate along the radial direction of a circle center at the same circle center angle, wherein the circle center is positioned on the substrate or not; the hydrophilic nucleation points are distributed on the substrate; the cross section of the micro-channel is triangular or inverted trapezoidal, and the sectional area of the micro-channel is increased in a gradient manner along the length direction; the interval between the adjacent microchannels is less than or equal to the width of the adjacent hydrophobic microchannels, and the width is increased in a gradient manner along the length direction; the distribution density of the hydrophilic nucleation points is increased along the increasing direction of the cross-sectional area of the microchannel.
2. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the width of the microchannels is in the range of 1 μm to 1mm, and the maximum length of each microchannel is no more than 100 mm; the width of the micro-channel and the interval between the adjacent micro-channels are gradually increased along the radius direction to the circumferential direction.
3. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the hydrophilic nucleation points are circular, the diameter of each hydrophilic nucleation point is 5-15 mu m, and the distance between every two hydrophilic nucleation points is 20-100 mu m; and a plurality of hydrophilic nucleation points distributed on the micro-channels with the same width form a hydrophilic nucleation array.
4. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the substrate presents hydrophobicity after hydrophobic treatment, and the hydrophilic nucleation points present hydrophilicity after hydrophilic treatment; the hydrophobic treatment comprises chemical modification fluorosilane and chemical vapor deposition, and the hydrophilic treatment comprises plasma treatment and laser cutting.
5. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the shape of the hydrophobic substrate is selected from a circle, a rectangle or a circular ring.
6. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the hydrophobic substrate is of a plane or curved surface structure.
7. The biomimetic condensation enhanced heat transfer surface of claim 1, wherein: the hydrophobic substrate is made of copper, aluminum, stainless steel or alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099346.3A CN112229234A (en) | 2020-10-14 | 2020-10-14 | Bionic condensation enhanced heat transfer surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099346.3A CN112229234A (en) | 2020-10-14 | 2020-10-14 | Bionic condensation enhanced heat transfer surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112229234A true CN112229234A (en) | 2021-01-15 |
Family
ID=74112950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011099346.3A Pending CN112229234A (en) | 2020-10-14 | 2020-10-14 | Bionic condensation enhanced heat transfer surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112229234A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877234A (en) * | 2021-10-12 | 2022-01-04 | 上海交通大学 | Low-pressure microgravity water vapor enhanced condensation and collection device |
| CN114322617A (en) * | 2022-02-15 | 2022-04-12 | 上海豪承信息技术有限公司 | Heat pipe for enhancing heat transfer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050081552A1 (en) * | 2003-10-09 | 2005-04-21 | Robert Nilson | Axially tapered and bilayer microchannels for evaporative coolling devices |
| US20080115916A1 (en) * | 2006-11-16 | 2008-05-22 | Onscreen Technologies, Inc. | Cooling device for an electronic component |
| CN106892399A (en) * | 2015-12-21 | 2017-06-27 | 华中科技大学 | A kind of bionical moisture condensation and collection structure and preparation method thereof |
| 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 |
| CN109631611A (en) * | 2019-01-26 | 2019-04-16 | 广州航海学院 | Strengthen the hydrophobic substrate and apparatus and method of condensing heat-exchange |
-
2020
- 2020-10-14 CN CN202011099346.3A patent/CN112229234A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050081552A1 (en) * | 2003-10-09 | 2005-04-21 | Robert Nilson | Axially tapered and bilayer microchannels for evaporative coolling devices |
| US20080115916A1 (en) * | 2006-11-16 | 2008-05-22 | Onscreen Technologies, Inc. | Cooling device for an electronic component |
| CN106892399A (en) * | 2015-12-21 | 2017-06-27 | 华中科技大学 | A kind of bionical moisture condensation and collection structure and preparation method thereof |
| 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 |
| CN109631611A (en) * | 2019-01-26 | 2019-04-16 | 广州航海学院 | Strengthen the hydrophobic substrate and apparatus and method of condensing heat-exchange |
Non-Patent Citations (1)
| Title |
|---|
| 李卓: "硅基不等宽矩形微槽道平板热管研制", 《万方硕士论文数据库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877234A (en) * | 2021-10-12 | 2022-01-04 | 上海交通大学 | Low-pressure microgravity water vapor enhanced condensation and collection device |
| CN114322617A (en) * | 2022-02-15 | 2022-04-12 | 上海豪承信息技术有限公司 | Heat pipe for enhancing heat transfer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112229234A (en) | Bionic condensation enhanced heat transfer surface | |
| US20210278141A1 (en) | Flat heat pipe having a gradient wetting structure | |
| JP2977128B2 (en) | Specially structured packing element having bidirectional surface texture and method of mass and heat transfer using the packing element | |
| JPH05695Y2 (en) | ||
| US20140238646A1 (en) | Sloped hierarchically-structured surface designs for enhanced condensation heat transfer | |
| US20130153184A1 (en) | Heat exchanger | |
| JP2012137288A (en) | Heat exchanger | |
| CN1097719C (en) | Fin tube heat exchanger | |
| EP3038743B1 (en) | Tower packing element, tower packing, and packing tower and mixer comprising the same | |
| JP2008180468A (en) | Heat exchanger | |
| US4578227A (en) | Splash bar method and apparatus | |
| US20040060769A1 (en) | Sound attenuation apparatus and method | |
| JP4029628B2 (en) | Anti-frosting member and heat exchanger | |
| CN115014107A (en) | Double-effect enhanced heat exchange micro-channel heat sink with wing-shaped flow dividing ribs | |
| CN114322617A (en) | Heat pipe for enhancing heat transfer | |
| CN217005470U (en) | Directional soaking plate and chip | |
| CN111834309B (en) | Mixed wettability micro-nano composite enhanced heat exchange structure and preparation method thereof | |
| CN109631611A (en) | Strengthen the hydrophobic substrate and apparatus and method of condensing heat-exchange | |
| KR20010029551A (en) | Film fill-pack for inducement of spiraling gas flow in heat and mass transfer contact apparatus with self-spacing fill-sheets | |
| US5730000A (en) | Structured packing element and a mass and heat transfer process using such packing element | |
| US20070163757A1 (en) | Surface with reduced particle deposition and reduced ice formation | |
| US4402362A (en) | Plate heat exchanger | |
| CN218447881U (en) | Cold source plate, composite microstructure condensate drop bouncing soaking plate and chip | |
| RU2529288C1 (en) | Package of heat exchange device plates | |
| RU2044248C1 (en) | Finned heat-exchange tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210115 |
|
| RJ01 | Rejection of invention patent application after publication |