Interaction of two deformable viscous drops under external temperature gradient

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:242

Article

Berejnov, V ; Lavrenteva, OM ; Nir, A

关键词: droplets interaction;    thermocapillary migration;    drop deformation;    boundary-integral equations;   

DOI  :  10.1006/jcis.2001.7769

来源: Elsevier

【 摘 要 】

The axisymmetric deformation and motion of interacting droplets in an imposed temperature gradient is considered using boundary-integral techniques for slow viscous motion. Results showing temporal drop motion, deformations, and separation are presented for equal-viscosity fluids. The focus is on cases when the drops are of equal radii or when the smaller drop trails behind the larger drop. For equal-sized drops, our analysis shows that the motion of a leading drop is retarded while the motion of the trailing one is enchanced compared to the undeformable case. The distance between the centers of equal-sized deformable drops decreases with time. When a small drop follows a large one, two patterns of behavior may exist. For moderate or large initial separation the drops separate. However, if the initial separation is small there is a transient period in which the separation distance initially decreases and only afterward the drops separate. This behavior stems from the multiple time scales that exist in the system. (C) 2001 Academic Press.

【 授权许可】

Free