Abstract
The effects of surface active impurity on flow around and inside a spherical liquid drop in another liquid phase are studied theoretically, on the basis of the "stagnant cap model" developed by Savic and by Davis and Acrivos. It is found that only a little modification is sufficient for the previous theory, which completely neglected the viscosity effect of the drop phase. Bulk-phase transfer of the surfactant is taken into account. Available data on terminal velocities of drops are analyzed by the calculated results.
