上方が拘束された水平上向き加熱平板上自然対流の流動と伝熱〔熱工学, 内燃機関, 動力など〕

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The present paper describes experimental results on the fluid flow and heat transfer of natural convection in between the upward-facing, horizontal heated plate and the insulated cover plate. The experiments were carried out with water. The widths of the test plates W and their gaps H were changed as W=50〜250 mm and H=10 mm〜∞ (no cover plate). The visualization studies with dye and liquid crystal thermometry revealed that the roll cells of which axes parpendicular to the flow direction appear and become dominant over the heated plate with decreasing the gaps. These roll cells inhibit the heat transfer and, thus, the heat transfer coefficients become smaller than those without cover plate. While, it is found that the flow and heat transfer in the region near the plate edges are unaffected by the cover plate. The conditions of the above reduced heat transfer are determined empirically. Moreover, the non-dimensional correlations for the local and the over all heat transfer coefficients of the heated plates are proposed based on the present heat transfer results.
一般社団法人日本機械学会の論文
1997-12-25