Method for calculating shape of PW-Cassie condensate droplet on super-hydrophobic surface

A calculation method and super-hydrophobic technology, applied in surface tension analysis, surface/boundary effects, measuring devices, etc., can solve problems such as errors and achieve good results
CN113109211APending Publication Date: 2021-07-13ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Publication Date
2021-07-13

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Abstract

A method for calculating the shape of a PW-Cassie condensate droplet on a super-hydrophobic surface comprises the following steps: (1) establishing a calculation hypothesis; (2) establishing an isolated droplet system; (3) calculating the free energy of the isolated droplet system; (4) optimizing the free energy of the surface of the condensate droplet; (5) writing a program by utilizing a nonlinear optimization function fmincon in MATLAB software, and searching variables ui and vi (i = 1, 2,..., N + 1) to enable the free energy of the system to be minimum under the constraint; and recording the coordinates of the discrete point pi (ui, vi) corresponding to the minimum free energy, and fitting the discrete point pi (ui, vi) to obtain a profile curve. According to the method, the problem of calculation of the contour form of the PW-Cassie condensate droplets partially infiltrated on the super-hydrophobic surface is solved, the coincidence degree with experimental observation is better, and the method has extremely important guiding significance for theoretical research on heat transfer of the PW-Cassie condensate droplets on the super-hydrophobic surface and is expected to guide design of an efficient condensation heat transfer surface.
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Description

technical field

[0001] The invention belongs to the field of surface wettability, and relates to a method for calculating the shape of PW-Cassie condensate droplets on a superhydrophobic surface, in particular to a calculation method based on minimum free energy theory, finite difference method and nonlinear optimization algorithm to obtain PW-Cassie condensation Computational methods for droplet profile morphology. Background technique

[0002] Condensation is a ubiquitous phenomenon in nature. Whether it is dew on the lawn or water droplets on the bathroom wall, it is formed by the phase change of latent heat released by water vapor when it comes into contact with a surface below its saturation temperature. Since the heat transfer coefficient of droplet condensation is 1 to 2 orders of magnitude higher than that of film condensation, it has more efficient heat transfer performance. However, due to different surface properties, condensate droplets will exhibit different we...

Claims

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