Abstract
The effect of a horizontal plane solid surface on a gas bubble migrating in a direction normal to it, under the combined action of buoyancy and thermocapillarity, was investigated experimentally. Even though the bubbles changed substantially in size during the experiments, the migration velocities were found to be in very good agreement with the predictions from a quasi-static theory. The most interesting observation from the experiments is that it is possible for a bubble to move more rapidly, in the direction of the temperature gradient, in the presence of the surface than when isolated. It is necessary for the buoyant and thermocapillary forces to act in opposition for this to occur. This counterintuitive behavior is a consequence of the rapid decay of the disturbance velocity field arising from thermocapillarity compared to the relatively slow decay of the disturbance velocity field for body force driven motion.
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