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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v17.i2.40
pages 153-168

Flow and Heat Transfer Characteristics of a Channel with Cut Fins

Kazuya Tatsumi
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Mitsuhiro Yamaguchi
Osaka Prefecture University, Sakai, Osaka
Y. Nishino
Toyama Prefectural University, Toyama, Japan
Kazuyoshi Nakabe
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

ABSTRACT

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.