垂直な加熱円柱に沿う強制-自然対向流共存対流の流動と伝熱

概要

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Opposing mixed convective flows adjacent to a vertical, heated cylinder have been investigated experimentally. The flow and heat transfer under the influence of strong buoyancy force are of particular interest. Experiments were conducted for the ranges of Reynolds and modified Rayleigh numbers 2×10^3<Re_L<2×10^4 and 7×10^9<Ra_L^*<2×10^<12>. The flow fields around the cylinder were visualized. The results indicate that the separation of forced flow occurs at the bottom edge of the cylinder when the nondimensional parameter (Gr_L^*/Re_L^<2.5>)=0.8, and reaches the upper edge when (Gr_L^*/Re_L^<2.5>)=5.0. The local heat transfer coefficients of the cylinder were also measured. The results show that the minimum and maximum coefficients appear at the separation and the reattachment points of the forced flow, respectively. The heat transfer data were correlated with the nondimensional parameters to yield a general heat transfer formula.
一般社団法人日本機械学会の論文
1996-12-25