Linear stability in systems with intensive mass transfer - III. Gas-liquid film flow

A linear analysis of the stability of the flow in a laminar boundary layer under conditions of intensive interphase mass transfer between gas and liquid film, when high mass fluxes through the phase boundary induce secondary flows, is suggested. The influence of the interface velocity on the hydrodynamic stability of the gas flow is significant in the present case. The critical Reynolds numbers are obtained at different intensities of non-linear mass transfer in a laminar boundary layer. The influence of the direction of the intensive interphase mass transfer on the hydrodynamic stability is shown as well. The motion of the interface leads to a decrease of velocity gradients, which is the cause for an increase in stability of the flow. The flow is stable at large Reynolds number in the liquid phase. The dependencies of the critical Reynolds numbers from the normal and tangential component of the interface velocity are shown. Stability of the flow is more `sensitive' to a change in the normal component.