假塑性流体液滴撞击壁面上的铺展的格子Boltzmann模拟  

Simulation of shear-thinning droplets impact on solid surfaces by using Lattice Boltzmann method

作　　者：周平[1] 曾忠[1] 乔龙[1] ZHOU Ping;ZENG Zhong;QIAO Long(College of Aerospace Engineering,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学航空航天学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2018年第12期1-9,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(11572062);长江学者和创新团队发展计划资助项目((IRT_17R112)~~

摘　　要：流体液滴在壁面上的铺展与沉积在工业应用中存在广泛应用,研究非牛顿流体特性对液滴铺展的影响具有重要的实际意义。基于相场法建立了非牛顿幂律流体与牛顿流体的两相流格子Boltzmann模型,引入包括接触角影响的边界条件,模拟了假塑性流体在幂律指数(n)0.5～1.0以及韦伯数(We)5～45时液滴撞击壁面的铺展过程。结果表明:相对于牛顿流体,幂律流体的非牛顿特性会抑制液滴的铺展,且n越小,越有利于液滴沉积。此外,韦伯数越大,液滴越快地达到稳定。The droplet spreading and deposition appear widely in industrial applications,and it is of practical significance to study the effect of non-Newtonian rheology on droplets impact on solid surfaces.In this research,we developed a two-phase lattice Boltzmann model based on the phase field method for power-law fluid flows.By introducing a contact angle condition,power-law droplets impact on solid surfaces was investigated,and the effects of power exponent n (0.5≤n≤1.0)and Weber number We (5≤We≤45)on shear-thinning droplets impact were evaluated.The results indicate that power-law liquid inhibits the droplet spreading and splashing,and it becomes easier for deposition with the decrease of n.In addition, droplets are easier to reach stationary state as weber number increases.

关 键 词：格子BOLTZMANN方法 幂律液体 假塑性流体 相界面 相场法 液滴沉积 液滴铺展 

分 类 号：O359[理学—流体力学]