Lattice Boltzmann study on the dynamics of successive droplets impact on a solid surface
Lattice Boltzmann study on the dynamics of successive droplets impact on a solid surface
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DOI：
10.1016/j.ces.2016.02.017
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发表时间：
2016-05
影响因子：
4.7
通讯作者：
K. A. Raman;R. Jaiman;Thong-See Lee;H. Low
中科院分区：
文献类型：
--
作者：
K. A. Raman;R. Jaiman;Thong-See Lee;H. Low
本文报道了液滴连续撞击固体表面的三维数值计算。采用基于高密度比的格子Boltzmann模型进行两相计算，并使用基于几何的接触角制剂来模拟移动接触线。本工作的重点是在初始间隙的碰撞液滴之间的碰撞行为和相互作用的动力学。在撞击过程中，拖尾液滴速度、表面润湿性、液滴粘度和表面张力对随时间变化的动力学的影响进行了研究。两种不同的瞬态相互作用模式观察到不同的速度比。随着前进接触角的增加，观察到在单相碰撞模式的情况下，初级扩展增加。偏心率的影响，通过液滴之间的偏移，被发现导致液滴形态的不对称演变。被动粒子示踪剂被播种在液滴内部，以将混合过程可视化为在与固体表面的碰撞期间紧密相互作用的液滴的时间序列。
Three dimensional computations on successive droplet impingement on a solid surface are reported. A high-density ratio based lattice Boltzmann model is employed for the present two phase computations and a geometric-based contact angle formulation is used to model the moving contact line. The focus of the present work is on the impact behaviour and the interaction dynamics between the impinging droplets with an initial gap. The effects of trailing drop velocity, surface wettability, drop viscosity and surface tension on the time-dependent dynamics are investigated during the impingement process. Two different transient interaction modes are observed for different velocity ratios. With increase in advancing contact angle, it is observed that primary spreading increases in the case ofin-phasemode of collision. Effect of eccentricity, through the offset between the droplets, is found to result in an asymmetric evolution of droplet morphologies. Passive particle tracers are seeded inside the droplets to visualize mixing process as a time sequence of closely interacting droplets during the impact with a solid surface.