リブ付チャネル乱流の速度場と温度場の直接数値シミュレーション(熱工学,内燃機関,動力など)

概要

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A detailed knowledge of both velocity and thermal fields in wall turbulence disturbed by a row of ribs on the wall is important for clarifying the chief factors of fluid and thermal dynamics related to the control of heat transfer. In this study, in order to elucidate the effects of roughness on the statistical quantities in the velocity and thermal fields, direct numerical simulations (DNS) of heat transfer in turbulent channel flows with transverse-rib roughness are performed by varying their interval, width and height, in which the turbulent heat transfer with k-type and d-type roughness walls are simulated. It is found that since turbulent mixing is promoted by arranging ribs, the distributions of mean velocity and temperature become asymmetric markedly. And the systematic variations of secondary flow patterns between ribs are clearly identified. With the k-type roughness, the best heat transfer performance is found to be obtained.
一般社団法人日本機械学会の論文
2004-01-25