一列管群の下流に直交して置かれた円柱の局所熱伝達特性

概要

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The local mass transfer has been measured for a circular cylinder placed downstream of and perpendicular to a single row of cylinders in a uniform flow. Using flow visualization techniques and a flow direction probe, and considering the wall pressure distributions, the flow behavior around the cylinder was investigated varying the distance, L, between the upstream and downstream cylinders under the constant Reynolds number, 5×10^4. The characteristics of the local mall transfer and fluid behavior could be classified into two patterns as follows : (1) At 1.5≦L/D≦2.5, a horse-shoe-like vortex and inner secondary vortex were detected using flow visualization techniques. The local mass transfer distributions show a remarkable three-dimensionality due to these vortices. (2) At 2.5≦L/D≦8.0, the distribution of he Sherwood number were similar to that in the super critical Reynolds number range without the free-stream turbulence in appearance. However the mass transport mechanism between them was basically different because of the formation of the ordinary separation line.
一般社団法人日本機械学会の論文
1989-08-25