Dynamics of viscous vesicles in shear flow

The dynamics of giant lipid vesicles under shear flow is experimentally investigated. Consistent with previous theoretical and numerical studies, two flow regimes are identified depending on the viscosity ratio between the interior and the exterior of the vesicle, and its reduced volume or excess su...

Full description

Saved in:
Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2006-04, Vol.19 (4), p.389-397
Main Authors: MADER, M.-A, VITKOVA, V, ABKARIAN, M, VIALLAT, A, PODGORSKI, T
Format: Article
Language:English
Subjects:
Biomechanics
Chemistry
Colloidal state and disperse state
Computer Simulation
Condensed Matter
Elasticity
Exact sciences and technology
Fluid mechanics
General and physical chemistry
Liposomes - chemistry
Mechanics
Membrane Fluidity
Membrane Lipids - chemistry
Membranes
Models, Chemical
Models, Molecular
Molecular Conformation
Phase Transition
Phosphatidylcholines - analysis
Phosphatidylcholines - chemistry
Physics
Shear Strength
Soft Condensed Matter
Stress, Mechanical
Viscosity
Water - chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The dynamics of giant lipid vesicles under shear flow is experimentally investigated. Consistent with previous theoretical and numerical studies, two flow regimes are identified depending on the viscosity ratio between the interior and the exterior of the vesicle, and its reduced volume or excess surface. At low viscosity ratios, a tank-treading motion of the membrane takes place, the vesicle assuming a constant orientation with respect to the flow direction. At higher viscosity ratios, a tumbling motion is observed in which the whole vesicle rotates with a periodically modulated velocity. When the shear rate increases, this tumbling motion becomes increasingly sensitive to vesicle deformation due to the elongational component of the flow and significant deviations from simpler models are observed. A good characterization of these various flow regimes is essential for the validation of analytical and numerical models, and to relate microscopic dynamics to macroscopic rheology of suspensions of deformable particles, such as blood.
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2005-10058-x