正浮力によるカルマン渦列の崩壊消滅 : 後流振動と表面特性に与える流体種類の影響

概要

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Effect of fluid type on wake oscillation and surface value in suppression of the Karman vortex street due to positive buoyancy from a heated circular cylinder submerged in an upward mainstream is elucidated by numerical calculation of the Navier-Stokes equations with buoyant term and the energy equation for mercury, air and water flow. Numerical results are validated. The Strouhal number decreases abruptly at the critical Richardson number Ri_c, which can be regarded as the exact boundary between the regions of the transformed vortex street and the plume flow. The largest Ri_c is for water, the smallest is for air. The mean Nusselt number of water flow decreases abruptly at Ri_c. This is because that the local Nusselt number near the rear stagnant point decreases at Ri_c due to a formation of a twin vortex.
一般社団法人日本機械学会の論文
1998-12-25