Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

被引:28
|
作者
Wu, J. [1 ]
Huang, J. J. [2 ]
Yan, W. W. [3 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Dept Aerodynam, Nanjing 210016, Jiangsu, Peoples R China
[2] Chongqing Univ, Dept Engn Mech, Chongqing 400044, Peoples R China
[3] China Jiliang Univ, Coll Metrol & Measurement Engn, Hangzhou 310018, Zhejiang, Peoples R China
关键词
Droplet impact; Bond number; Weber number; Droplet arrangement; Lattice Boltzmann method; SINGLE DROP; SPLASH;
D O I
10.1016/j.colsurfa.2015.07.043
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The numerical study of droplets impact behaviors onto a solid substrate is performed in this work. With a given impact velocity, one or two two-dimensional droplets subsequently interact with the substrate. During the process of droplet development on the substrate, the gravity is taken into account. To conduct numerical simulations, a hybrid method is adopted, in which the flow field is solved by using the lattice Boltzmann method and the interface is captured by solving the Cahn-Hilliard equation directly. The effects of Bond number (Bo, ratio of gravity to surface tension of droplet), Weber number (We, ratio of inertial force to surface tension) and droplet arrangement on the dynamic behaviors of droplets impact are systematically investigated. After a single droplet impact, a higher Weber number can lead to a longer contact length. In addition, the occurrence of bubble entrapment is determined by the Bond number. On the other hand, in the case of two droplets impact, several segments accompanying with their detachment from the surface are observed when two identical droplets are initially placed close to each other. Moreover, sparse segments, which are attributed to the oblique jet, are produced when two droplets have different sizes. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:318 / 328
页数:11
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