Linear stability analyses of convection in two-layer system with an evaporating gas-liquid interface

Marangoni-Be´nard convective instability in a system of two layers consisting of an evaporating liquid layer and its vapor-phase layer, heated from below, is studied by a linear stability theory. Both phase-layers with infinite thickness are placed between two horizontal rigid boundaries while the top boundary wall is assumed as a porous medium through which the vapor phase is passed in a certain velocity. Both the unperturbed temperature profiles and the instability of two-layer convection are presented for a large variation region of the evaporating mass flow rate and different thickness ratio of two layers. The theoretical analysis results were compared with Chai & Zhang's experiment results. Copyright © 2003 by the International Aeronautical Federation. All rights reserved