基板上に碁盤目配列された円柱ブロック群の圧力損失と熱伝達

概要

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Pressure drop and heat transfer of arrays of in-line circular blocks on the wall of parallel channel were measured. The diameter and height of the block were 40 mm and 18 mm, respectively. The effects of the pitches of the blocks, the number of line and row and the other factors on the pressure drop, △p, and heat transfer were clarified. The pressure drop coefficient, ζ, is given by the sum of the pressure drop of three regimes : the inlet, intermediate and outlet part. And the coefficient ζ can be formulated and the recommended equation agrees with the experimental data within ±10%. The average Nusselt number of the block of 1st row is 10% lower than that of 2nd row. Those of 1st to 5th rows, Nu_<mi>can be approximately expressed within ±10% by the following equation : Nu_<mi>=0.118(Re/β)^<0.75>where β is the opening ratio. The average Nusselt number of 2nd to 5th rows was also correlated by using the pumping power, P_w, within 5% as follows : Nu^^^-=190P^<0.25>_w, where P_w=△pU_mA_o, U_m is the mean velocity and A_o is the cross-sectional area in a duct. Finally, the Nusselt number is represented by the non-dimensional expression as follows : Nu^^^-=0.134(ζ^<1/3>Re)^<0.75>.
社団法人日本機械学会の論文
2000-08-25