液滴在双凹型微结构表面铺展行为的格子Boltzmann模拟

Lattice Boltzmann Study on the Spreading Behavior of Droplets on the Doubly Reentrant Microstructure Surface

本文采用格子Boltzmann方法,对不同表面张力液滴在矩形、T型以及双凹型微结构表面上的铺展行为开展研究,结果表明当液滴表面张力较大时,液滴在三种结构表面静态接触角相同,而对低表面张力流体,液滴在双凹型微结构表面呈现最大的静态接触角。几何敏感性分析结果表明,微结构高度对于较高表面张力液滴的静态接触角影响不大,对于低表面张力液滴,微结构高度越大则静态接触角越大;宽间比对液滴的静态接触角影响显著,宽间比越小,液滴的静态接触角越大.

A Lattice Boltzmann Method is used to study the spreading behavior of liquid droplets with different surface tensions on the microstructure surfaces including simple structures, reentrant structures and doubly reentrant structures, Numerical results indicate that the static contact angle of liquid droplets with high surface tension on the three microstructure surfaces above are the same and the static contact angle of liquid droplets with low surface tension on doubly reentrant structure surface is the biggest. Furthermore, pillar height shows little dependence on static contact angle with high surface tension liquid, and for low surface tension liquid, higher pillars can increase the static contact angle. Also, the static contact angle is dependent on the ratio of width and spacing and smaller ratio can increase the contact angle.