液滴撞击液膜过程的格子Boltzmann方法模拟

发布时间：2018-01-08 07:08

  本文关键词：液滴撞击液膜过程的格子Boltzmann方法模拟　出处：《物理学报》2016年08期 　论文类型：期刊论文

  更多相关文章： 格子Boltzmann方法 液滴 液膜

【摘要】：本文采用格子Boltzmann方法对液滴撞击液膜过程进行了研究,主要考察了雷诺数(Re)、韦伯数(We)、相对液膜厚度(h)以及表面张力(σ)等物理参数对界面运动过程的影响.首先,随着Re数和We数的增加,可以明显观察到液滴撞击液膜过程中形成的皇冠状水花以及卷吸现象;当Re数较大时,液体会发生飞溅,由液体飞溅形成的小液滴则会继续下落,并与液膜再次发生碰撞.其次,当相对液膜厚度较小时,液滴撞击液膜并最终导致液膜断裂;然而随着相对液膜厚度的增大,尽管撞击过程溅起的液体会越来越多,但是液膜并不会发生断裂.再次,随着表面张力的增大,界面变形阻力增大,撞击过程中产生的界面形变也逐渐减弱.最后还发现皇冠(由液滴溅起形成)半径r随时间满足r/(2R)≈α√U t/(2R),这一结果与已有结论是一致的.
[Abstract]:In this paper, the lattice Boltzmann method is used to study the impingement of liquid droplets on the liquid membrane, and the Reynolds number (Reo) and the Weber number (Weber number) are mainly investigated. The effect of physical parameters such as relative liquid film thickness (h) and surface tension (蟽) on the interfacial motion process. Firstly, with the increase of re number and We number. The phenomenon of crown waterfall and entrainment in the process of droplet impingement on the liquid membrane can be observed obviously. When re number is larger, the liquid will spatter, and the droplets formed by the liquid spatter will continue to fall and collide with the liquid film again. Secondly, when the relative liquid film thickness is small. The liquid droplets impinged on the liquid film and eventually caused the liquid film to break; However, with the increase of the thickness of the relative liquid film, although more and more liquid will be spattered during the impact process, the liquid film will not break. Thirdly, with the increase of surface tension, the resistance of interfacial deformation increases. Finally, it is found that the radius r of the crown (formed by droplet splashing) is r / / 2R with time) 鈮，

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