PHYSICAL JOURNAL E Oscillatory convection in binary mixtures: Thermodi®usion, solutal buoyancy, and advection

Abstract. The role of thermodi®usive generation of concentration °uctuations via the Soret e®ect, their contribution to the buoyancy forces that drive convection, the advective mixing e®ect of the latter, and the di®usive homogenisation are compared and elucidated for oscillatory convection. Numerically obtained solutions of the ¯eld 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 °uid. 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