液态合金毛细射流不稳定性的模拟分析  

Simulation of the Instability of Liquid Alloy Capillary Jet

作　　者：于洋[1] 史耀武[1] 夏志东[1] 雷永平[1] 李晓延[1] 郭福[1] 陈树君[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《北京工业大学学报》2010年第4期534-539,共6页Journal of Beijing University of Technology

基　　金：国家'八六三'计划资助项目(2002AA322040);'十一五'计划资助项目(2006BAE03B02);北京市自然科学基金资助项目(012003);2006高等学校博士学科点专项科研基金资助项目(20060005006)

摘　　要：采用计算流体力学软件FLUENT,应用动网格模型实现对射流施加干扰,用VOF模型追踪相界面的演变过程,实现了对射流施加干扰、射流断裂及液滴下落的全过程模拟,并研究了干扰频率对液态Sn-Bi不稳定性的影响.研究结果表明,射流速度的波动性是射流形成缩颈的主要原因;随干扰频率的增加,射流断裂后形成的液滴直径变小;在最佳干扰频率作用下,射流断裂时长度最小;模拟结果与实验结果基本一致.The capillary jet break up into a train of drops with artificial perturbation,which can be applied into many fields.Due to the small dimension and high velocity of the jet,especially for the jet in other liquid,it＇s very difficult to trackle the detail of the jet breakup.In this study,with the help of the dynamic mesh method and Volume of Fluids（VOF） method,the whole process including the application of the perturbation to the jet,jet breaking up into droplets,and droplets falling in the oil was simulated by the computational fluid dynamics（CFD） software FLUENT.The effect of perturbation frequency on the Sn-Bi jet breakup in silicon oil was studied.The results show that the fluctuation of jet velocity is found to account for the presence of necking of jet.With the increasing of the perturbation frequency,the diameter of the droplet decreases.The jet breakup length is the shortest when the optical perturbation frequency is applied,and the numerical results agree well with the experimental ones.

关 键 词：毛细射流断裂 动网格 干扰 

分 类 号：TG425.1[金属学及工艺—焊接]