液滴在化学异构表面上侧向弹跳的计算机模拟研究  

Computer Simulation of Droplets Bounce Laterally on Chemical Isomerism Surfaces

作　　者：管羿鸣 季婷婷 杨鑫宇 闻炳海[1] GUAN Yiming;JI Tingting;YANG Xinyu;WEN Binghai(Guangxi Key Laboratory of Multi-Source Information Mining and Security,Guangxi Normal University,Guilin Guangxi 541004,China)

机构地区：[1]广西师范大学广西多源信息挖掘与安全重点实验室,广西桂林541004

出　　处：《广西师范大学学报（自然科学版）》2021年第2期90-100,共11页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金(11862003,81860635);广西自然科学基金(2017GXNSFDA198038)。

摘　　要：液滴撞击润湿性不同的表面会产生不同的动态行为,数值模拟是研究该现象的一种有效方法。采用基于化学势的晶格Boltzmann方法,通过调整接触角来改变固体表面的润湿性,对液滴撞击单一接触角的疏水表面以及接触角分布不同的疏水表面所产生的动态行为进行模拟和分析。当给疏水表面施加单一接触角时,液滴的弹跳高度随表面接触角的增大而增大,并且当接触角增大到160°时会产生二次弹跳现象,大于170°时产生多次弹跳现象;当给疏水表面施加分布不同的接触角时,根据表面接触角设置方法的不同,所产生的液滴弹跳现象会有相应的差异。结果表明,当液滴撞击2种接触角交界处时,液滴总是向接触角小的一方侧向弹跳,其弹跳高度和距离取决于2种接触角的差值,并给出了该差值分别与弹跳高度和距离的基本关系。这种特性对实现有效控制液滴动态行为十分有帮助,可广泛应用于自清洁、喷墨打印等领域。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.

关 键 词：晶格Boltzmann方法 数值模拟 接触角 润湿性 液滴侧向弹跳 

分 类 号：O35[理学—流体力学]