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VOLUME 94 | ISSUE 7 | PAGE 553
Motion of near-spherical micro-capsule in planar external flow
S. S. Vergeles, P. E. Vorobev

Landau Institute for Theoretical Physics RAS, 142432 Chernogolovka, Russia
Moscow Institute of Physics and Technology, 141700 Dolgoprudnyj, Russia

Abstract
Dynamics of a micro-capsule with compressible membrane placed into planar flow is considered. The form of the capsule is assumed to be near-spherical and the membrane forces are calculated in the first order in respect to the membrane displacement. We have established that the capsule dynamics is governed by two dimensionless parameters in this limit, which account for membrane stretch nodulus B, viscosities if inner fluid and solvent, capsule radius, external flow gradient and Taylor deformation parameter at rest. Phase diagram for capsule dynamical regimes is plotted on the plane of these two dimensionless parameters in the limits of low and high viscosity contrast between the fluid inside the capsule and the solvent.


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