A restricted exploratory investigation has been made to examine the plausibility, of finding that Garter-type vortices may explain the increased heat transfers found in many instances in which conventional explanations have failed. Because of the complexity of the analytical setting, the current treatment was put within reach of solution by restriction of the prenatal number to high and low values, so that the energy and momentum equations may be decoupled. It is indeed found that these vortices effect increases in heat transfer and that a part of the mechanism is a tendency of the vortices to slow down the velocity in the fluid at an increased rate (as compared with the case without these vortices) in the region where they bring the fluid away from the wall and to increase it where the fluid is brought down.
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