負浮力によるカルマン渦列の発達に与える流体種類の影響〔熱工学, 内燃機関, 動力など〕

概要

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For clarification of effect of fluid type on the development of the Karman vortex street due to negative buoyancy in a circular cylinder wake with a downward freestream of mercury and water, the two-dimensional, laminar, time-dependent continuity equation, Navier-Stokes equations with the buoyancy term, and energy equation are solved numerically. With a decrease in the Prandtl number of the developed vortex street, the phase of temperature fluctuation in delayed than that of velocity, and flow asymmetry increases and temperature asymmetry decreases. Due to negative buoyancy, with decreasing the Prandtl number, a scale and spiral of a vortex become large and strong, and the wake frequency and vortex velocity decrease. The developed vortex street therefore never occurs in any isothermal wake.
一般社団法人日本機械学会の論文
1998-06-25