新伝熱管の性能研究 : 第5報, 管群の伝熱性能の式表示

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  • Researches on New Heat Transmitting Tubes : 5th Report, Formula Expressing the Heat Transmission Characteristics of Tube Bundles
  • シン デンネツカン ノ セイノウ ケンキュウ 5

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We have been studying experimentally the heat transmission characteristics of our tubes of a new type in the case of air flowing across the bundles of tubes, and have already reported a portion of the results four times. Putting together all the results of our researches, we obtained the design data of the heat exchanger which consists of our new heat transmitting tubes. The main design formulas are as follows : 1) The heat transfer coefficient of Ist tubes in staggered arrangement for ratios p1/d=p2/d=2.11 is given by the equation Nu=0.602Re0.527, in which p1 is the longitudinal pitch of tubes and p2 is the transverse pitch of tubes, d is the outer diameter of tube, and Re is Reynolds number calculated with the maximum velocity between the tubes. 2) The pressure loss Δp of air flow through the bundle is given by the equation Δp=nψγumax2/2g, in which n is the number of tube rowas in flow direction, γ is the specific weight of the air, and umax is the maximum velocity that occurs between the tubes. The coefficient of resistance ψ may be obtained from the equation ψ=2.81Re-0.224.

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