The effect of insoluble surfactant at dilute concentration on drop breakup under shear with inertia

被引:52
|
作者
Drumright-Clarke, MA
Renardy, Y
机构
[1] Virginia Tech, Dept Math, Blacksburg, VA 24061 USA
[2] Virginia Tech, ICAM, Blacksburg, VA 24061 USA
[3] SW Res Inst, San Antonio, TX 78238 USA
关键词
D O I
10.1063/1.1628232
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Direct numerical simulations are conducted with a volume-of-fluid continuous surface stress algorithm. The linear equation of state is used to characterize the effects of an insoluble surfactant at low concentration on a drop in strong shear. The drop and the surrounding liquid have the same viscosity and density. Surfactant migration induces a Marangoni force that acts toward the drop center. For low inertia, viscous force opposes the Marangoni force, so that a stationary drop with surfactant is more elongated and less tilted than without. The addition of surfactant promotes breakup, lowering the critical capillary number. The first daughter drops are smaller than for the case of clean drops. For high inertia, the Marangoni force retracts the drop and retards breakup. The local values of surface tension are computed during drop evolution. (C) 2004 American Institute of Physics.
引用
收藏
页码:14 / 21
页数:8
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