Lattice Boltzmann simulation of droplet collision dynamics
Lattice Boltzmann simulation of droplet collision dynamics
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DOI：
10.1016/j.ijheatmasstransfer.2003.08.030
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发表时间：
2004-10
影响因子：
5.2
通讯作者：
T. Inamuro;S. Tajima;F. Ogino
中科院分区：
文献类型：
--
作者：
T. Inamuro;S. Tajima;F. Ogino
提出了一种求解大密度比两相流体流动的格子Boltzmann方法。该方法被应用到模拟的二元液滴碰撞的各种韦伯数为20<We<80和0 B<0.82在雷诺数Re=2000的冲击参数。考虑具有相同直径的两个液滴。液体与气体的密度比固定为50。模拟了聚并碰撞和两种不同类型的分离碰撞，即反射分离和拉伸分离。发现合并碰撞和分离碰撞之间的边界，并与现有的理论预测吻合良好。在不同的碰撞参数下，模拟了分离碰撞过程中的混合过程，得到了混合率与碰撞参数的关系。
A lattice Boltzmann method for two-phase fluid flows with large density ratios is presented. The method is applied to the simulations of binary droplet collisions for various Weber numbers of 20<We<80 and for impact parameters of 0⩽B<0.82 at the Reynolds number of Re=2000. Two droplets with the same diameter are considered. The density ratio of the liquid to the gas is fixed at 50. Coalescence collision and two different types of separating collisions, namely reflexive and stretching separations, are simulated. The boundaries between the coalescence collision and both of the separating collisions are found and compared with an available theoretical prediction in good agreement. The mixing processes during separating collisions are also simulated for various impact parameters at We≈80, and the relation between the mixing rate and the impact parameter is obtained.