简单剪切流条件下液滴破碎和碰撞模拟

工程热物理学报 , 2007, 28(z1): 189-192.

简单剪切流条件下液滴破碎和碰撞模拟

陈硕 ^1, , 尚智 ^2, , 王丹 ^3, , 赵钧 ^4, , 范西俊 ^5,

1.上海交通大学机械与动力工程学院,上海,200030

2.上海交通大学机械与动力工程学院,上海,200030

3.上海交通大学机械与动力工程学院,上海,200030

4.英特尔公司封装技术部,上海,200131

5.Cooperative Research Centre for Polymers,32 Business Park Drive,Notting Hill,Vic.3168,Australia

基金项目: 教育部留学回国人员科研启动基金上海市高等学校优秀青年教师后备人选计划(B4725A) 国家自然科学基金(50576051)

关键词：耗散粒子动力学 , 液滴 , 破碎 , 碰撞

SIMULATING THE BREAKUP AND COLLISION OF DROPS IN SIMPLE SHEAR FLOW

利用耗散粒子动力学(DPD)对简单剪切流条件下液滴的破碎和碰撞分离过程进行了模拟.液滴由多颗简单的DPD粒子构成,液滴与周围流体的不互溶性由提高它们之间的保守力系数获得.通道的上下壁面沿着相反方向运动从而使流体产生简单剪切流动.计算结果表明,在简单剪切流条件下,当界面张力数超过临界界面张力数后,液滴不稳定;液滴将被拉长并破碎成数个较小的稳定的液滴.当两个液滴相互碰撞并分离的现象发生时,两个液滴的质心在速度梯度方向上的距离与整个碰撞过程相关,碰撞之后的δz值比碰撞前的δz大.

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