Abstract
The rate of decrease in the magnitude of the maximum tangential velocity of laboratory Karman vortexes is found to be essentially as predicted by means of a two-dimensional theory for the diffusion of vorticity. The implication is clear that surface friction effects are not overriding. Certain features of atmospheric Karman vortexes suggest that they are in some important respects dynamically similar to the laboratory vortexes, and thus these vortexes may also experience rather small energy losses from surface friction.
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