平板層流境界層におかれた長方形柱まわりの流れと熱伝達

概要

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Experiments were performed to investigate the fluid flow and heat transfer around a rectangular cylinder in a flat plate laminar boundary layer. The height of the cylinder H was varied and the width c was constant. The Reynolds number, defined as U_∞c/ν, ranged from 3.8×10^3 to 1.2×10^4, and the value of the ratio H/δ was varied from 0.48 to 5.2, where δ is the thickness of the laminar boundary layer without the cylinder. The local heat transfer coefficients on each face were measured and discussed in relation to the fluid flow, that is, the flow visualization and the turbulent intensity around the cylinder. The flow pattern on the upper side of the cylinder changes from laminar flow type to separation and reattachment flow types increasing the value of H/δ or (U_∞H/ν)・(H/c). The heat transfer performance corresponds to these flow patterns. Especially, introducing the characteristic length d=(2H+c)/π,the average Nussel numbers on each face are generally correlated to the form Nμ_d=C(Re_d√<H/c>)^n.
一般社団法人日本機械学会の論文
1990-09-25