フィン付き管型熱交換機ユニットの流動・伝熱総合特性 : 中間レイノルズ数域における3次元非定常数値解析 : 熱工学, 内燃機関, 動力など

概要

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In this study, a three-dimensional unsteady numerical analysis has been made for a one unit of single row plate-finned tube heat exchanger located in a uniform flow. The effects of Reynolds number and fin pitch on local and mean Nusselt number and pressure coefficient were examined parametrically. The unsteadiness of the flow revealed some important effects on heat transfer from the fin-and-tube surface. The unsteadiness depends on not only tube diameter but also fin pitch. Karman vortex structure is observed in the instantanous flow field and twin vortex structure is seen in the time mean flow field. As Reynolds number or fin pitch increases, unsteadiness is strengthened so that low heat transfer area of the fin behind the tube decreases. Pressure coefficient shows a peak that would be related to increasing of the momentum by the unsteady flow.
一般社団法人日本機械学会の論文
2001-01-25