Abstract
An interesting phenomenon that the measured induced fluid velocity by a rotating circular cylinder is much smaller than that of conventional fluid dynamic theory will be reported and discussed. While authors have been suggesting that there are centurial misunderstandings in vortex theories of fluid dynamics in these several years, in this paper, it will be cleared that there are finite vortex flow layer adjust to the outer wall of rotating circular cylinder, the phenomenon has been overlooked so far. Authors will present some new hypothesis about the boundary phenomena to explain and to contribute the progress of vortex flow theory.
