每年出版 8 期
ISSN 打印: 1065-5131
ISSN 在线: 1563-5074
Indexed in
Flow and Heat Transfer Characteristics of a Channel with Cut Fins
摘要
Square-shape notches were applied to a parallel fin array, referred to as a "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 conditions. In the cut-fin case, although the heat transfer area was reduced, a comparable heat transfer performance to the notchless plain-fin case was obtained. The notch size did not largely affect the overall heat transfer performance due to the tradeoff between the increase of local heat transfer rate at fin sidewalls and the reduction of total 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 for minimizing the fin thermal resistance was found and the fin pitch of the cut-fin case was narrower than that of the plain-fin case. As the Reynolds number, Re, was increased in the range of 1000 ≤ Re ≤ 2000, the heat transfer coefficient remained almost constant in the plain-fin case but increased in the cut-fin case.
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