側壁加熱・冷却される水平矩形流路内の複合対流熱伝達に及ぼす流路断面縦横比の影響

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This paper described the effect of aspect ratio on mixed convection in horizontal rectangular duct with heated and cooled side walls numerically and experimentally. In the numerical analysis, fluid flow and temperature distributions for Ri = 1.61, Pr = 6.99, Re = 100 and aspect ratio, Ar = 0.2 ˜ 10, were obtained by solving non-dimensional governing equations by SIMPLE procedure. QUICK scheme was applied to convection term of these equations. In the experimental analysis, flow behavior for Ar = 0.5 ˜ 2 was visualized by dye-injection method. Numerical results show that the swirl flow was generated along the flow direction, and its pitch length was influenced with Ar. The pitch length was the shortest in Ar = 0.5 ~ 1, and this tendency was the same in numerical results and experimental results. The heat transfer behavior was also discussed corresponding to the flow, and the heat transfer ratio was highest at Ar = 1 in 0.2 < Ar < 10.
2011-04-01