新伝熱管の性能研究 : 第5報, 管群の伝熱性能の式表示

概要

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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 p_1/d=p_2/d=2.11 is given by the equation N_u=0.602R_e^<0.527>, in which p_1 is the longitudinal pitch of tubes and p_2 is the transverse pitch of tubes, d is the outer diameter of tube, and R_e 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=nψγu_<max>^2/2g, in which n is the number of tube rowas in flow direction, γ is the specific weight of the air, and u_<max> is the maximum velocity that occurs between the tubes. The coefficient of resistance ψ may be obtained from the equation ψ=2.81R_e^<-0.224>.
社団法人日本機械学会の論文
1960-11-25