双乳液液滴形变及破碎特性

Deformation and Breakup Characteristics of Double Emulsion Drop

本文基于VOF(Volume of Fluid)相界面追踪方法,建立了不可压缩W_1/O/W_2双乳液液滴动力学模型并进行了数值求解,模拟了双板平行剪切流条件下液滴在流场中的稳定变形与破碎过程。研究结果表明:液滴的稳定变形程度随着毛细数的增大而加剧,且双乳液内液滴的变形程度要明显小于液滴整体变形程度;液滴雷诺数为0.05时,存在一个0 57～0.58之间的临界毛细数,当液滴毛细数小于临界毛细数时,液滴只发生稳定变形,反之则发生破碎。

Based on the VOF method,a hydrodynamic model is developed and numerically analyzed to study the steady deformation and breakup of W_1/O/W_2 incompressible double emvdsion drop subjected to the double-plate shear flow.The results indicate that the steady deformation of double emulsion drop increases with the increasing capillary number,and the deformation of the inner drop is obviously smaller than that of the integral drop.In addition,there is a critical capillary number at Reynolds number of 0.05.between 0.57 and 0.58.The steady deformation of drop occurs until the capillary number increases to this critical value,otherwise the breakup of drop of drop is observed.