PHYSICAL MATHEMATICS SEMINAR


TOPIC:		INSTABILITY OF VISCOUS AND BUOYANT MISCIBLE 
		FLUIDS IN CONFINED GEOMETRIES

SPEAKER:	PROFESSOR DOMINIQUE SALIN
		University Pierre et Marie Curie (Paris 6)

ABSTRACT:

Miscible fluids displaced at high flow rate provide an interface whose
shape is only controlled by viscous and buoyancy forces.  When mixing
occurs, either at low flow rate or due to the porous structure through
which they flow, the continuous change in both density and viscosity leads
to new features.

We have experimentally and theoretically investigated viscous and/or
buoyant instabilities of miscible fluid displacements in a Hele-Shaw cell
(2 parallel plates separated by a tiny gap), in a cylindrical tube and in
porous media.  We discuss instability thresholds and new patterns observed
in such restricted geometries.

DATE:		TUESDAY, NOVEMBER 16, 1999

TIME:		2:30 PM

LOCATION:	Building 2, Room 338


Refreshments will be served at 3:30 PM in Building 2, Room 349