震动加速度作用下气泡行为数值模拟研究

Numerical simulation on bubble behavior under oscillation acceleration condition

在开源OpenFOAM架构下,建立震动加速度作用下的气泡-水两相流数值模拟模型,利用该模型对气泡在震动下的行为进行了分析研究。结果表明:相同震动角频率下,振幅越大,气泡变形越大,位移也越大;相同振幅下,角频率越大,气泡变形越大,位移变化越快;当角频率大于一定值时,气泡变形严重,导致破裂。对比有无震动的气泡上升过程发现,震动使气泡的形状与位置变得不稳定,左右摇摆上升,并使流场变得混乱。

On the basis of the open source software OpenFOAM,a bubble-water two-phase flow numerical simulation model under oscillation acceleration condition was established.Validation of this model was conducted and the simulation results agreed well with the experimental results. Then this model was used to investigate the bubble behavior under oscillation acceleration condition.The results show that,with the same oscillation angular frequency,the larger the oscillation amplitude,the greater the bubble's deformation and displacement;with the same oscillation amplitude,the larger the oscillation angular frequency,the greater the bubble's deformation and displacement;when the oscillation angular was larger than a certain value,the serious deformation would cause breakage of the bubble.Comparison of the bubble rising behavior with and without oscillation indicated that,oscillation make the bubble rise with instable shape and position,and confused the flow filed.