Separation Criteria for Off-Axis Binary Drop Collisions
Separation Criteria for Off-Axis Binary Drop Collisions
复制标题
离轴二元跌落碰撞的分离标准
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
N. Ashgriz
中科院分区：
文献类型：
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作者：
Mary Saroka;N. Ashgriz
对两个等尺寸液滴的离轴碰撞进行了数值研究。讨论了这种碰撞的各种控制过程。几种常用的预测碰撞后分离开始的理论模型基于数值观察的过程进行了评估。提出了基于液滴变形的分离准则。数值结果用于评价几种常用的碰撞后液滴分离现象模型的有效性。此外，还报道了摩擦碰撞后液滴分离的临界韦伯数。研究了雷诺数的影响，并在韦伯-雷诺数平面上绘制了高冲击参数碰撞的永久聚并和分离区域。
Off-axis collisions of two equal size droplets are investigated numerically. Various governing processes in such collisions are discussed. Several commonly used theoretical models that predict the onset of separation after collision are evaluated based on the processes observed numerically. A separation criterion based on droplet deformation is found. The numerical results are used to assess the validity of some commonly used phenomenological models for drop separation after collision. Also, a critical Weber number for the droplet separation after grazing collision is reported. The effect of Reynolds number is investigated and regions of permanent coalescence and separation are plotted in a Weber-Reynolds number plane for high impact parameter collisions.