斜め波状壁を用いた再生熱交換器の熱流動特性(熱工学,内燃機関,動力など)

概要

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A series of direct numerical simulation in modeled counter-flow heat exchangers with oblique wavy walls is made toward optimal shape design of recuperators. The effects of oblique angles and amplitudes of the wavy walls are systematically examined, and the heat transfer and pressure loss characteristics are investigated. The flow structures are drastically modified due to the counter rotating streamwise vortices induced by the wavy walls. By using optimal oblique angles and amplitude of the wavy walls, significant heat transfer enhancement is achieved with relatively small pressure loss penalty. When thermal coupling of hot and cold fluid passages is considered, the averaged Nusselt number can be larger than that for isothermal heated condition. This is due to the dissimilarity between the velocity and thermal fields near the top and bottom walls. It is also found that the secondary flow and the associated thermal fields strongly depend on the Reynolds number.
一般社団法人日本機械学会の論文
2004-10-25