Eur. Phys. J. E 15, 293-304 (2004)
DOI: 10.1140/epje/i2004-10069-1

Oscillatory convection in binary mixtures: Thermodiffusion, solutal buoyancy, and advection

D. Jung, P. Matura and M. Lücke

Institut für Theoretische Physik, Universität des Saarlandes, D-66041, Saarbrücken, Germany

luecke@lusi.uni-sb.de

(Received 20 July 2004 / Published online 18 November 2004)

Abstract

The role of thermodiffusive generation of concentration fluctuations via the Soret effect, their contribution to the buoyancy forces that drive convection, the advective mixing effect of the latter, and the diffusive homogenisation are compared and elucidated for oscillatory convection. Numerically obtained solutions of the field equations in the form of spatially extended relaxed traveling waves, of standing waves, and of the transient growth of standing waves and their transition to traveling waves are discussed as well as spatially localized convective states of traveling waves that are surrounded by the quiescent fluid.

PACS
47.20.-k - Hydrodynamic stability.
47.20.Ky - Nonlinearity (including bifurcation theory).
47.54.+r - Pattern selection; pattern formation.
47.27.Te - Convection and heat transfer.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004