強制流動流体中の平面板の熱伝達に関する実験的研究(第2報)

概要

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In the 1st report, we reported on the experimental results regarding to heat transfer at the surface of smooth flat plate in forced flow. In this report, we report on the results of experiments on rough plate. It is thought that the effect of roughness on surface heat transfer, is varied by height, depth, pitch and shape of roughness elements. At first, we experimented on the effect of the pitch of elements of roughness. Roughness of surface is given by making the parallel grooves that is perpendicular to flowing direction. In the case of flat front edge plate, the special turbulent boundary layer was seen in any position over certain Reynolds'Number, and in its range, N_u/R_e was constant in any R_e. And the value of N_u/R_e was maximum in the case of a certain pitch for grooved plate with same depth, where N_u is Nusselt's Number and R_e is Reynolds's Number.
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