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Hydrophobic surface, preparation method and application thereof in dropwise condensation heat transfer

A hydrophobic surface, drop-like condensation technology, applied in the application of hydrophobic surface, drop-like condensation heat transfer, preparation field, to achieve the effect of simple process, low cost, accelerated merging and shedding

Inactive Publication Date: 2013-10-23
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, researchers have either formed a droplet condensation state by constructing micro-nanostructures, or promoted the excretion of condensate by constructing micronanostructures. There are few literatures on the influence of anisotropic micro-nanostructured hydrophobic surfaces on the droplet condensation process.

Method used

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  • Hydrophobic surface, preparation method and application thereof in dropwise condensation heat transfer
  • Hydrophobic surface, preparation method and application thereof in dropwise condensation heat transfer

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preparation example Construction

[0030] In the preparation method of the above-mentioned hydrophobic surface, the hydrophobic surface is directly constructed on the surface of the substrate, or the prepared hydrophobic flexible film with a micro-nano two-level structure is fixed on the surface of the substrate. The construction methods of surface micro-nano two-level structure include but not limited to spin-coating, photolithography, electrolysis and other micro-nano structure processing methods. details as follows:

[0031] 1) Fabricate a photoresist insulation shielding film with a grid line pattern on the surface of the metal sample by combining spin coating and photolithography, and grind the surface of the metal sample to make the surface smooth;

[0032] 2) After step 1), use the metal sample (metal surface) as the electrolysis anode, turn on the power, and carry out electrolysis;

[0033] 3) After the electrolysis is finished, turn off the power first, then take the metal sample out of the holding de...

Embodiment 1

[0039] refer to figure 1 and figure 2 , the overall shape of the micro-nano two-level structure constructed on the surface of the substrate by the hydrophobic surface is mainly a grid-shaped structure; the size of the strip-shaped protrusions and grooves in the grid-shaped structure is micron, and the random columnar array spread over it is nanometer level structure. The direction of the grid lines is consistent with the direction of gravity during the condensation heat transfer process.

[0040] Based on the integral model of droplet condensation heat conduction established by Rose, taking the maximum diameter of droplet in the condensation process of each surface as the main comparison index, the anisotropic micro-nano structure hydrophobic surface prepared by the present invention and the existing non-anisotropic micro-nano structure hydrophobic The heat flux of the surface and nano-structured hydrophobic surface was calculated, and the results proved that the heat flux ...

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Abstract

The invention discloses a hydrophobic surface, a preparation method and application thereof in dropwise condensation heat transfer, and relates to the fields of micro-nano manufacturing, condensation heat transfer and the like. The hydrophobic surface has a micro-nano two-level structure, wherein the micro-nano two-level structure is anisotropic and the hydrophobic surface has anisotropic wettability. On one hand, the micro-nano two-level structure of the hydrophobic surface can promote realization of dropwise condensation, and can significantly improve the heat transfer efficiency compared with the common filmwise condensation,; on the other hand, the anisotropic wettability of the hydrophobic surface can affect condensation and fall of water drops to a certain extent and can accelerate discharge of liquid drops under the influence of gravity and other factors, thereby further improving the condensation heat transfer efficiency.

Description

technical field [0001] The invention relates to the technical field of micro-nano manufacturing and condensation heat transfer, in particular to a hydrophobic surface, a preparation method and its application in dropwise condensation heat transfer. Background technique [0002] With the development of science and technology, solving the problem of increasing energy shortage has become a research hotspot for relevant workers in various countries. For thermal energy, which is a widely used form of energy, how to improve the heat transfer efficiency in the process of thermal energy application has attracted increasing attention. Condensation heat transfer, as an effective heat transfer method, is widely used in industry; dropwise condensation heat transfer, as an ideal condensation heat transfer method, has a high heat transfer coefficient, which is better than that widely used in modern industry. The film condensation heat transfer coefficient is more than an order of magnitu...

Claims

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Application Information

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IPC IPC(8): B82B1/00F28F27/00B82B3/00B82Y30/00B82Y40/00B05D5/08
CPCF28F13/04F28F2245/04
Inventor 王莉王权岱丁玉成崔志波严诚平
Owner XI AN JIAOTONG UNIV
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