平板乱流境界層内に設置された円柱突起まわりの熱伝達特性(熱工学,内燃機関,動力など)

概要

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Heat transfer around a cylindrical protuberance placed in a turbulent boundary layer was measured. The diameter of the cylindrical protuberance, D, was either 40 or 80mm, and the aspect ratio of the protuberance H/D (=height/diameter) ranged from 0.125 to 1.0. Reynolds number based on D ranged from 1.1×10^4 to 1.1×10^5. The thickness of the turbulent boundary layer at the position of the protuberance ranged from δ=26 to 120mm. The local heat transfers on the top and side face of the cylindrical protuberance was measured under the condition of constant heat flux. The present paper investigated the effects of the thickness of the boundary layer and the aspect ratio of the protuberance on the heat transfer. It was found that the overall heat transfer of the protuberance had a maximum at H/δ=0.24.
一般社団法人日本機械学会の論文
2004-05-25