Experimental simulation of capillary effect on rough flat surfaces--颗粒学报PARTICUOLOGY

Zuo, Z., Wang, J., Huo, Y., Wang, D., & Ji, H. (2022). Experimental simulation of capillary effect on rough flat surfaces. Particuology, 60, 115-123. https://doi.org/10.1016/j.partic.2021.03.011

Experimental simulation of capillary effect on rough flat surfaces

Ziwen Zuo ^a, Junfeng Wang ^b *, Yuanping Huo ^b, Dongbao Wang ^b, Hongbing Ji ^c *

a Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
b School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
c Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China

10.1016/j.partic.2021.03.011

Volume 60, January 2022, Pages 115-123

Received 4 April 2020, Revised 24 February 2021, Accepted 16 March 2021, Available online 14 April 2021, Version of Record 23 October 2021.

E-mail: wangjunfeng@ujs.edu.cn; jihb@mail.sysu.edu.cn

Highlights

• Capillary effect on the rough flat surfaces was simulated by a 2D model.

• Capillary force was independent of roughness under homogeneous wetting.

• Capillary force was positively correlated with roughness under heterogeneous wetting.

Abstract

The movement of the liquid column inside the slit was utilized to experimentally simulate the characteristics of the capillary force per unit length for different rough flat surfaces. The movement of the liquid column was achieved by continuously changing the slit interval. The maximum climb height and contact angle of the liquid column were observed during this process to study the relationship between capillary force and contact surface roughness. Based on the assumption that the microstructures on the rough surfaces are of the same form and continuously and uniformly distributed, it is shown that the capillary force per unit length under homogeneous wetting is independent of the roughness. For heterogeneous wetting, the capillary force per unit length is positively correlated with the roughness. The results also indicate that the appearance of “contact line pinning” is caused by insufficient capillary force along the direction of liquid column movement.

Graphical abstract

Keywords

Contact angle; Contact line; Capillary force; Rough surfaces

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