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AKB: Biologische Physik

AKB 12: Soft-Matter Nanofluidic Devices

AKB 12.4: Vortrag

Dienstag, 28. März 2006, 15:00–15:15, ZEU 255

Vesicle deformation in shear and capillary flows — •Hiroshi Noguchi and Gerhard Gompper — Institut fuer Forstkoeperforschung, Forschungszentrum Juelich 52425 Juelich, Germany

We study the dynamics of vesicles in shear flow and in micro-channels. A new simulation technique is presented, which combines a three-dimensional mesoscale simulation technique, multi-particle collision dynamics[1] for the solvent with a dynamically-triangulated surface membrane model. The deformation of vesicles is an important subject not only of fundamental research but also in medical applications. For example, in microcirculation, the deformation of red blood cells reduces the flow resistance of microvessels. We focus the effects of membrane viscosity in shear flow [2,3] and the effects of the shear elasticity and bending modulus of membrane in capillary flow [4]. We have found several shape transtions. In capillary flow, an elastic vesicle (red-blood-cell model) transits from a discocyte to parachute-like shape, while the fluid vesicle transits into prolate with increasing flow rate. In both cases, the shape transitions reduce the flow resistance.

[1] A. Malevanets and R. Kapral, J. Chem. Phys. 110, 8605 (1999)

[2] H. Noguchi and G. Gompper, Phys. Rev. Lett. 93, 258102 (2004)

[3] H. Noguchi and G. Gompper, Phys. Rev. E 72, 011901 (2005)

[4] H. Noguchi and G. Gompper, Proc. Nat. Acad. Sci. USA 102, 1415993 (2005)