わずかな傾き角のある長方形断面柱まわりの流動と熱伝達 : 断面辺長比5の場合

概要

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Experimental investigations on the fluid flow and the heat transfer from a rectangular cylinder at an angle of attack to the air stream were carried out in the range of 2560≦Re≦12800. The width/height ratio c/d of the section was 5.0 and the angle a ranged from 0 to 20°. At α=0°, the separated shear layers reattach to the upper and lower faces intermittently. At α≧5°, the lower shear layer reattaches on the lower face. The reattachment flow becomes turbulent, while the flow is laminar at α>15°. The local heat transfer coefficients around the cylinder become clear in connection with the flow characteristics. The local heat transfers on the reattachment face, and the upper and rear faces are given by the same form as Nu=CRe^<2/3>. The constant C decrease with an increase in a at α>5°. Finally, the maximum average heat transfer is obtained between 0 and 5°.
一般社団法人日本機械学会の論文
1991-09-25