円柱冷却による低レイノルズ数でのカルマン渦列の発生 : 発生原因と流体種類の影響

概要

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For clarification of the cause and effect of fluid type on the generation of the Karman vortex street due to cooling of a cylinder at a low Reynolds number where the Karman vortex street does not occur in an isothermal wake, the two-dimensional, laminar, time-dependent continuity equation, Navier-Stokes equations with the buoyant term of Boussinesq's approximation, and energy equation are solved numerically for a circular cylinder wake with an upward freestream of mercury, air, and water. The cause is the generation of the wake vorticity which does not occur in an isothermal wake, and a stable arrangement of vorticity. With a decrease in the Prandtl number of the fluid, the Karman vortex street is generated easily by cooling of a cylinder, and has lower frequency, lower velocity of the vortex movement, and larger scale of vortex spiral than the isothermal Karman vortex.
一般社団法人日本機械学会の論文
1997-11-25