Abstract
We have been studying experimentally the heat transmission characteristics of our tubes of a new type in the cases of the air flowing across the bundles of tubes, and have already reported a portion of the results two times. Putting together all the results of our researches, we obtained the design data for a heat exchanger which consists of our new heat transmitting tubes. The main design formulas are as follows : 1) The heat transfer coefficient of 1 st tubes in staggered arrangement for ratios p1/d0=p2/d0=2.11 is given by the equation Nu=0.602 Re0.527 in which p1 is the longitudinal pitch of tubes and p2 is the transverse pitch of tubes, d0 is the outer diameter of tube, and R6 is the Reynold's number calculated with the maximum velocity between the tubes. 2) The pressure loss Δp of the air flow through the bundle is given by the equation [numerical formula] in which n is the number of tube rows in the flow direction, γ is the specific weight of the air, and Umax is the maximum velocity between the tubes. The coefficient of resistance ψ may be determined from the equation ψ=2.81R6-0.224
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