切欠きフィン付設流路内の熱流動特性(<小特集>技術移転を目指す熱・燃焼工学最前線)

概要

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Square shape notches were applied to a parallel fin array, referred to as "cut-fin", for the purpose of enhancing the fluid mixing and heat transfer, and also reducing the pressure loss penalty. Three-dimensional numerical simulation, velocity measurement and heat transfer experiment were carried out for a rectangular channel with cut-fins mounted on the bottom wall, and the notch size and spanwise fin pitch effects on the fin performances were evaluated under laminar flow condition. In the cut-fin case, although the heat transfer area was reduced, a comparable heat transfer performance to the notch-less plain-fin case was obtained. The notch size did not largely affect the overall heat transfer performance due to the trade-off problem between the heat transfer coefficient at fin sidewalls and the extended heat transfer area. Reduction of the friction loss was also achieved in this case, indicating an increase of the total performance. An optimum value of the fin pitch in minimizing the fin thermal resistance was found and the value of the cut-fin case was smaller than that of the plain-fin case. As the Reynolds number, Re, was increased in the range of 1000⪇Re≤2000, heat transfer coefficient remained constant in the plain-fin case but increased in the cut-fin case.
社団法人日本機械学会の論文
2007-07-25