Abstract
The Stokes flow induced in a hemispheroidal region when heat is deposited in the region through a finite size electrode is investigated. It is shown that for a given depth of the region the intensity of the induced flow field decreases with increasing size of the electrode. The direction of the flow field is in the opposite sense to that induced in the same region when the fluid motions are induced by the discharge of an electric current into the medium. The observation somewhat explains why a current greater than that predicted by theory may be passed through a weld pool without a breakdown in the velocity.
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