IWNET

2006

4th International workshop on nonequilibrium thermodynamics and complex fluids
3-7 september 2006, Rhodes, Greece
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ORAL PRESENTATION
Session: 4 Complex fluid deformation and rheology: Theories and thermodynamic relationships
(scheduled: Tuesday, 09:40 )

Dynamics of an interface or membrane between two fluids

B.U. Felderhof
RWTH Aachen, Aachen, Germany

The dynamics of a flat interface or membrane between two viscous fluids is studied on the basis of the linearized Navier-Stokes equations. The dispersion equation for interfacial waves involves surface tension and elasticity moduli of the interface, besides gravitational acceleration. It is shown that in a symmetric case, where the two fluids have equal viscosity and equal mass density, there is a decoupling of the capillary-gravity wave and the longitudinal elastic wave. The displacement of the interface due to a force density applied at the interface is characterized by a susceptibility tensor. Wave excitation due to a monochromatic plane wave source or a monochromatic line source located at some distance from the interface are discussed. © IWNET 2006
© and Kleanthi for IWNET 2006