基于相场—格子Boltzmann方法的铝液滴碰撞行为数值模拟研究

Numerical Simulation on Collision Behaviors of Binary Aluminum Droplets Based on Phase Field-lattice Boltzmann Method

本文采用相场–格子Boltzmann方法研究了偏心度B=0.06,韦伯数We=15~190情况下双铝液滴的碰撞行为。捕获了对撞双铝液滴的大变形融合行为及产生“卫星液滴”的自反分离行为,发现随着We增大,自反分离产生的“卫星液滴”数量增加。此外,将LBM模拟得到的铝液滴发生自反分离行为的临界We与两类自反分离模型的预测值进行了对比,发现与黏性液滴自反分离模型相比,忽略黏性的自反分离预测模型能够对铝液滴近对心碰撞中出现的大变形融合和自反分离行为的临界We进行更准确的预测,这与铝液滴低黏度的特点相符。

Phase field-Lattice Boltzmann method is used in this work to research the collision behaviors of binary Aluminum droplets with B=0.06 and W e=15~190.Behaviors of coalescence after substantial deformation and reflexive separation producing satellite droplets are captured.The critical W e marking the transition from coalescence to separation obtained from simulation are compared with the results derived from two types of analysis model for separation prediction,which shows that the prediction values of model omitting viscosity of droplets fit better with the value of simulation results compared with its counterpart considering viscosity,on account of the significantly low viscosity of Aluminum droplets.