The effect of gibbs adsorption on marangoni instability in penetration mass transfer



A theoretical analysis of Marangoni convection in gas-liquid mass transfer shows the stabilizing effect of surface convection in the Gibbs adsorption layer. Results are obtained for various ratios of liquid layer thickness to mass transfer penetration depth. For deep liquid layers, complete stabilization results when the inventory in the Gibbs layer equals the solute deficiency in the liquid phase boundary layer, irrespective of the shape of the unperturbed concentration profile.

This new theory agrees much better with experimental results than did previous theories. For example, for triethylamine desorption from water, the discrepancy is reduced from a factor of 8,000 to a factor of 8. Speculations are offered concerning this residual discrepancy.