Abstract
Results are reported from experiments on the motion of methanol drops in a silicone oil under the combined action of gravity and thermocapillarity. The isothermal rise velocities of the drops were found to be significantly enhanced by the action of an upward temperature gradient. The data are not consistent with existing predictions for a drop with a clean interface. Therefore, the data are interpreted with the help of a recently developed simple theoretical model which accounts for the influence of surfactants.
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