Hydrodynamic interaction between two drops in an oscillating shear flow: do they attract or repel?
Abstract
Deformation and overall dynamics of two drops in an oscillating shear flow is numerically investigated. The situation is simulated with a finite-difference/front-tracking scheme at finite Reynolds number. The effects of variation of material properties (surface tension, density and viscosity) and flow variables (amplitude of the shear rate and its frequency) are studied with the help of appropriate non-dimensional parameters. In case of rigid particles, strong form of reversibility and linearity with velocity of Stokes flow leads to a constant separation between them. However, the deformable drop boundary characterized by a finite interfacial tension and finite flow inertia destroys the strong from of flow reversibility. The drop deformation gives rise to an effective interaction force between the two drops. Simulation results will be presented. Possible implications for hydrodynamically driven self-assembly will be discussed.
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2003
- Bibcode:
- 2003APS..DFD.DF009S