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Method for calculating outline and contact angle of heavy liquid drop on horizontal regular double-roughness surface

A calculation method and roughness technology, which is applied to the calculation of the heavy droplet profile and contact angle on the horizontal regular double roughness surface, in the field of heavy droplet profile and contact angle on the horizontal regular double roughness surface, which can solve the accuracy limitation of the measuring device, Errors, operational accidental errors, etc.

Active Publication Date: 2018-12-11
ZHEJIANG UNIV OF TECH
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Problems solved by technology

However, there are problems such as the limitation of the accuracy of the measuring device and the occasional error in operation, and the measurement results will have different degrees of error.
In addition, some researchers in the liquid use calculation methods to obtain the contact angle, but still ignore some factors, such as "A Method for Obtaining the Contact Angle of Droplets on Regular Second-Order Structure Surfaces", the calculation method proposed in the patent application number 201611023855.1 is in the case of small droplets (ignoring gravity and only considering factors (2) and (3))

Method used

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  • Method for calculating outline and contact angle of heavy liquid drop on horizontal regular double-roughness surface
  • Method for calculating outline and contact angle of heavy liquid drop on horizontal regular double-roughness surface
  • Method for calculating outline and contact angle of heavy liquid drop on horizontal regular double-roughness surface

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Embodiment

[0205] The geometric structure size parameters of the secondary structure are: the side length of the square column of the nanostructure is ɑ 1 = 100nm, period distance b of regular square matrix 1 = 88nm, the height h of the square column 1 =400nm, the side length of the square column with micron structure is ɑ 2 =10μm, periodic distance b of regular square matrix 2 =8.26μm, the height h of the square column 2 = 13 μm. The intrinsic contact angle of the droplet on the primary structure, secondary structure and substrate is θ e0 = θ e1 = θ e2 = 106°.

[0206] As shown in Fig. 4, we conducted experiments to measure the profiles of heavy liquid droplets of different volumes on lotus leaves. At the same time, the simulated section of the heavy droplet is calculated. Both experimental and simulation results show that the contours of heavy droplets on the same lotus leaf become flattened with increasing volume. The simulated droplet profile (red line) agrees well with the...

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Abstract

The invention relates to a method for calculating an outline and a contact angle of a heavy liquid drop on a horizontal regular double-roughness surface. The method comprises the following steps: discretizing liquid drop outline; deducing dimensionless free energy functions of the system under four different wet contact states; optimizing the local minimal dimensionless free energy under the fourcontact states; optimizing the overall minimal dimensionless free energy under the four contact states. The density and volume of liquid drop, the topological structure and roughness of the surface and the interfacial tension between liquid drop, steam and material forming the rough surface are comprehensively considered, the limitation of the traditional research is broken through, researchers can be helped to further understand the wetting and diffusion mechanism of liquid drops and the method has an important practical significance in researching lossless transportation of liquid on super-hydrophobic self-cleaning surfaces and in pipelines, and the like.

Description

technical field [0001] The invention belongs to the technical field of micro-nano composite structures, and relates to a method for calculating the profile and contact angle of heavy liquid droplets on a horizontally regular double-roughness surface. degree surface heavy droplet profile and contact angle. Background technique [0002] A fundamental problem in the wetting and spreading mechanisms of heavy droplets is to study their shape on rough surfaces. Determining the shape of a droplet on a rough surface provides a better understanding of how the wettability of a rough surface can be altered. This is crucial for various practical applications of droplet manipulation in microfluidic chips, water self-collecting surface design, self-cleaning surface design, and efficient condensation heat transfer surface design. In general, the wettability of a solid surface is characterized by the contact angle of a liquid drop on it. The contact angle refers to the angle between the ...

Claims

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Application Information

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IPC IPC(8): G01N13/02G01N13/04
CPCG01N13/02G01N13/04G01N2013/0208G01N2013/0241G01N2013/0283
Inventor 董健董鹤刘佳炜金焱立
Owner ZHEJIANG UNIV OF TECH
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