Author(s)

B. Foudin & B. Caussade

Abstract

Prediction of mass transfer on a moving non oscillating spheroidal drop of water in presence of surfactant B. Foudin, B. Caussade 77VP - CamzV/e ABSTRACT Surface-active organic molecules are common constituents of atmospheric aerosol particles, raindrops, and snowflakes. Experimental investigations have shown that a surfactant even present at very low concentration alter the interface conditions by reducing both mterfacial velocities and mass transfer rates (sometimes), at the level of a moving droplet. Two conflicting views as to the distribution of surface active material over the surface are numerically examined for zero and large surface Peclet numbers It seems reasonable that either a surfactant concentration gradient with an almost freely circulating interface or an immobile cap region over the rear of the globule with an almost rigid interface could exist, depending on the relative magnitudes of the shear stress and the interfacial tension g

Keywords