Convective patterns in a binary mixture with a positive separation ratio
Year: 1990
Authors: Bigazzi P., Ciliberto S., Croquette V.
Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;
LPS-ENS Paris france
Abstract: We pesent an experimental study of the convective patterns and their dynamics occurring in a binary mixture presenting a positive separation ratio. In this situation, both the concentration and the temperature fields are destabilizing, and they lead to two different kinds of convective patterns. Using quantitative optical methods, we have measured the convective motion wavevectors and their non-linear amplitude. For small temperature differences, only the concentration field is destabilizing and the convective motions are organized in a square pattern. We study the evolution of the wavevector and the amplitude of the square pattern. For larger temperature differences both fields are destabilizing and we investigate the competition between the square pattern, reminiscent of the concentration field, and the roll pattern associated with the temperature field. By studying the dynamics of this competition we have evidenced the existence of traveling waves which have been recently predicted by Linz et al..
Journal/Review: JOURNAL DE PHYSIQUE
Volume: 51 (7) Pages from: 611 to: 624
KeyWords: convection in liquids; flow instability; liquid mixturesDOI: 10.1051/jphys:01990005107061100Citations: 22data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here