Abstract
Drop motions may be a consequence of surface stresses induced by the Marangoni effect (i.e. by the variation of surface tension with temperature or surfactant concentration). In the present paper we consider a steady drop motion in a homogeneous medium, when Marangoni instability associated with radial temperature and/or concentration distributions outside and inside the drop occurs. Attention is paid to the case when the instability thresholds for two different modes are close to each other and a weakly nonlinear analysis is developed.
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