Performance of the Cross-Flow Heat Exchanger with Variable Physical Properties : 1st Report, In Case where the Overall Heat Transfer Coefficient Is Variable

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概要

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• In case where the overall heat transfer coefficient K varies with positions on the heat exchanger surface or fluid temperature in the cross-flow exchanger, the relations between the number of heat transfer units and the temperature efficiency ε are obtained analytically or numerically, assuming that K = 1+mx^n or K = 1+mθ^n in the nondimensional form referred to the standard value K_0. The effects of parameters m and n are shown quantitatively, arranging the calculated results by the ratio of the efficiency change (ε-ε_0)/ε_0, where ε_0 is the temperature efficiency for K = K_0 and by the single overall coefficient signifying "true mean overall coefficient". Further, it is shown that there is considerable difference among flow arrangements and that conventional methods are not sufficient for large value of m.

• 一般社団法人日本機械学会の論文

著者

• IZUMI Ryotaro

  Faculty of Engineering, Nagoya University

• YAMASHITA Hiroshi

  Faculty of Engineering, Nagoya University

• YAMAGUCHI Shigeki

  Nagoya Institute of Technology

• Izumi Ryotaro

  Faculty Of Engineering Nagoya University

• Izumi Ryotaro

  Professor Faculty Of Engineering Nagoya University

• YAMAGUCHI SHIGEKI

  Professor, Nagoya Institute of Technology

• Yamaguchi Shigeki

  Professor Nagoya Institute Of Technology

• Yamashita Hiroshi

  Faculty Of Engineering Nagoya University

• Yamashita Hiroshi

  Assistant Faculty Of Engineering Nagoya University

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