断面長方形の物体からの自然対流熱伝達

概要

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Natural convection heat transfer from vertically projected body under both conditions of uniform surface heat flux and uniform surface temperature was investigated numerically. The calculations were carried out for air (P_γ=0.7), G_<γH> from 4.96×10^3 to 8.49×10^7, G^*_<γH> from 3.28×10^4 to 1.22×10^<10> and the aspect ratios H/W from 1 to 6 Some examples of the stream lines and the isothermals are presented. The flow profiles are compared with the results of the smoke-injection flow visualization to show good coincidence. Varied aspects of vertex develop above the horizontal upword-facing surface. And the effect on the heat transfer from the horizontal surface significantly. The lowest value of N_<uW>/G_γ<W>^1/5) appears at G_<γH>≈ 1×10^6(G_<γH>≈3×10^7) for any value of H/W if the variation of N_<uW>/G_γW^<1/5>) is shown against Grashof number G_<γH> (G_<γH> ).
社団法人日本機械学会の論文
1985-02-25