Abstract
Abrupt Change of wake oscillation and surface character and effects of fluid type on it are elucidated by numerical calculation on suppression of the Karman vortex street due to positive buoyancy from a heated elliptic cylinder submerged ill upward mainstream of mercury, air or water. Abrupt change in the buoyant wake from an elliptic cylinder occurs at two different Richardson numbers, i.e. one is the first critical Richardson number, Ritr, and the other the second one, Ric(>Riir). At Ritr, the mean coefficient of the shear stress and the mean Nusselt number decrease abruptly for mercury and air, but increase abruptly for water. At Ric, the Strouhal number decreases abruptly for mercury and air, but begins to decrease continuously for water. The above characters for water differ qualitatively from those for mercury and air.
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