THE LINEAR-STABILITY IN SYSTEMS WITH INTENSIVE MASS-TRANSFER .1. GAS (LIQUID)-SOLID

A linear analysis of the stability of the how in a laminar boundary la yer under conditions of intensive interphase mass transfer, where high mass fluxes through the phase boundary induce secondary flows, is sug gested. These secondary flows have an effect of 'injection' or 'suctio n' in the boundary layer depending on the direction of the intensive i nterphase mass transfer, and they have a variable velocity along the l ength of the phase surface. They are also proportional to the local ma ss flux through the phase boundary. The critical Reynolds numbers are obtained at different intensities of non-linear mass transfer in the l aminar boundary layer. The influence of the direction of the intensive interphase mass transfer on the hydrodynamic stability is shown as we ll. In the cases shown intensive interphase mass transfer is directed toward the phase boundary (suction) and the increase of its intensity leads to an increase in the stability of the flow. In the opposite cas e (injection), turbulization results al considerably smaller values of the Reynolds number. Copyright (C) 1996 Elsevier Science Ltd.