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円柱冷却 によって低 レイ ノルズ数 で発生する冷却渦列* (第1報, 流れ分布の変化) 能 登 勝 久*1, 杉 村 聡*2 A Cooled Vortex Street Generated by Cooling a Circular Cylinder in Low Reynolds Number Wake (1st Report, Change of Flow Pattern) Katsuhisa NOTO*3 and Satoshi SUGIMURA *3 Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo, 657-8501 Japan A circular cylinder wake of air with negative buoyancy at low Reynolds numbers was analyzed numerically, and a new vortex street, i. e. "a cooled vortex street", was discovered as follows : A weak asymmetry in the isothermal wake, i. e. the wavy wake, centipede flow, oscillating twin-vortex, at low Reynolds numbers is amplified remarkably by intensive cooling of a cylinder. As a result, a cooled vortex street with intensive asymmetry occurs. The region of the Reynolds number Re and the Richardson number Ri occurring the cooled vortex street is much wider than those of the Karman vortex street. The Karman vortex street occurs by weak cooling of the isothermal wavy wake and centiped flow. However a Karman vortex street never occurs even though a cylinder is cooled at Re <24. A structure of the cooled vortex street differs exteremely from that of the Karman vortex street. That is, the asymmetry degree, size of vortex spiral, and vortex pitch of the cooled vortex street are much greater than those of the Karman vortex street. The cooled vortex street is a governing phenomenon in the cooled wake, and can be identified by employing the asymmetry degree of streamlines.