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4報)

概要

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This experiment was performed to make clear the influences of surface roughness on surfaceheat transfer systematically. In giving roughness to a plate surface, we created artificial roughness by carving projections of a fixed pitch. And by changing the pitch and height of projection, we researched the influence of surface roughness. Main results are as follows : - A turbulent boundary layer which is influenced by surface roughness is formed at larger Reynolds' number than a certain Reynolds' number and in this region the results almost satisfy the following relation. N_u=K'・R_e Where, N_u is Nusselt's number. The value of K' becomes maximam in every kinds of the height of roughness at h/p=0.055,which means the best heat transfer in such condition. The maximam value of K' becomes larger as the height of surface roughness becomes heigher.
一般社団法人日本機械学会の論文
1952-08-15