本文關(guān)鍵詞：液滴撞擊液膜過程的格子Boltzmann方法模擬　出處：《物理學報》2016年08期 　論文類型：期刊論文

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【摘要】：本文采用格子Boltzmann方法對液滴撞擊液膜過程進行了研究,主要考察了雷諾數(shù)(Re)、韋伯數(shù)(We)、相對液膜厚度(h)以及表面張力(σ)等物理參數(shù)對界面運動過程的影響.首先,隨著Re數(shù)和We數(shù)的增加,可以明顯觀察到液滴撞擊液膜過程中形成的皇冠狀水花以及卷吸現(xiàn)象;當Re數(shù)較大時,液體會發(fā)生飛濺,由液體飛濺形成的小液滴則會繼續(xù)下落,并與液膜再次發(fā)生碰撞.其次,當相對液膜厚度較小時,液滴撞擊液膜并最終導致液膜斷裂;然而隨著相對液膜厚度的增大,盡管撞擊過程濺起的液體會越來越多,但是液膜并不會發(fā)生斷裂.再次,隨著表面張力的增大,界面變形阻力增大,撞擊過程中產(chǎn)生的界面形變也逐漸減弱.最后還發(fā)現(xiàn)皇冠(由液滴濺起形成)半徑r隨時間滿足r/(2R)≈α√U t/(2R),這一結(jié)果與已有結(jié)論是一致的.
[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，

本文編號：1396096