The effect of interfacial tension gradients on the flow structure of single drops or bubbles translating in an electric field

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Abstract
Stream functions, interfacial velocities, and terminal velocities are computed for spherical drops or bubbles supporting interfacial tension gradients and translating in creeping flow in an electric field imposed in the direction of translation. In particular, the case in which a trace of surfactant is present is considered, and it is found that such material may produce quasi‐stagnant zones along the interface either near the poles or the equator. Terminal velocities may be either increased or decreased relative to the value obtained in the absence of the electric field.