Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (2): 90-100.doi: 10.16088/j.issn.1001-6600.2020031201

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Computer Simulation of Droplets Bounce Laterally on Chemical Isomerism Surfaces

GUAN Yiming, JI Tingting, YANG Xinyu, WEN Binghai*   

  1. Guangxi Key Laboratory of Multi-Source Information Mining and Security, Guangxi Normal University, Guilin Guangxi 541004, China
  • Received:2020-03-12 Revised:2020-07-10 Online:2021-03-25 Published:2021-04-15

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Abstract: There are many different dynamic behaviors when droplets impact different wettability surfaces. Numerical simulation method is a very simple and effective way to study this phenomenon. Based on the chemical potential lattice Boltzmann method, the wettability of solid surfaces is changed by adjusting the contact angle, and the dynamic behavior that droplets impact the hydrophobic surfaces of single contact angle and different contact angle distributions are simulated and analyzed. When a single contact angle is applied to the hydrophobic surface, the bounce height of the droplet increases as the contact angle of the surface increases, and the second bounce will occur when the contact angle increases to 160°, while the multiple bounce will occur when the contact angle increases to 170°. When differently distributed contact angles are applied to the surface, the droplets bounce phenomenon will be varied correspondingly. The results show that when a droplet impacts the junction of two kinds of contact angles, the droplet always bounces laterally to the side with a small contact angle, and its bounce height and distance depend on the difference between the two contact angles. Besides, the bounce height and distance are changing with the differences of the contact angle respectively. This characteristic is very helpful to effectively control the dynamic behavior of droplets and it can be widely used in self-cleaning, inkjet printing and other fields.

Key words: lattice Boltzmann method, numerical simulation, contact angle, wettability, droplets bounce laterally

CLC Number: 

  • O35
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