オフセットフィンの低レイノルズ数域における伝熱・流動特性 : (フィン配列の影響)

概要

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A three-dimensional analysis is carried out to study the effect of the fin-pitch irregularity on the heat transfer and the flow characteristics of offset fins for Reynolds number as low as 100 based on the hydraulic diameter. The results obtained are as follows. (1) The Nusselt number of the fin surface is maximum when the width r/s of the facing flow passage is increased by about 1.1 times the standard width, and is minimum when the width is decreased to as narrow as about 0.4 times. (2) The Nusselt number based on the base heating area decreases when the fin shifts from its standard position. The reduction decreases when the thermal conductivity ratio of the fluid to the fin increases. (3) The reduction rate of the friction factor increases as the aspect ratio h/s of the cross-sectional flow passage increases or the fin shifts markedly from its standard position.
社団法人日本機械学会の論文
1997-02-25