project title: Recent Issues in Hydrodynamics Connecting Viscous Fluids and Superfluids
project leader: Dr. Marc Rabaud
access given (in days): 14
access used (in days): 11
local host: Prof. Matti Krusius
home institution: FAST, Universite Pierre & Marie Curie
country of institution: France
starting date (yyyy-mm-dd): 2004-04-15
The hydrodynamic instability at the interface between two liquid layers, which occurs as a function of the difference in the tangential velocities across the interface and which is generally referred to as the Kelvin-Helmholtz instability, has recently been investigated in two sets of similar measurements: (1) in viscous flow in a Hele-Shaw cell and (2) in a superfluid in rotating 3He-B. [We refer to (1) L. Meignin, P. Condret, C. Ruyer-Quil, and M. Rabaud, Physical Review Letters vol. 90, p. 234502 (2003) and to (2) R. Blaauwgeers et al., Physical Review Letters vol. 89, 155301 (2002).] The purpose of this project is to compare the analysis of the different cases and discuss their relation to the classic description of the instability in terms of inviscid liquid flow.
The discussions have focused on the influence of dissipation and its treatment in the two cases. Prof. Rabaud has discussed the viscous case during his two visits to the Low Temperature Laboratory. At the same time he has received valuable insight for the analysis of his analogous experiments in his homeinstitute.