冷媒HCFC123の水平螺旋溝付鋼管内の蒸発熱伝達と圧力損失に関する実験的研究

概要

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This paper presents the experimental results for the flow boiling heat transfer and pressure drop of HCFC123 in horizontal steel tubes. The experiment was performed using a smooth tube with 12mm inner diameter and a spiral grooved tube with 12.5mm maximum inner diameter. Pressure drop gradient and heat transfer coefficient of both tubes were measured and compared. The measured pressure drop gradients of the grooved tube were 50% higher than those of the smooth tube while the measured heat transfer coefficients of the grooved tube were 100% higher than those of the smooth tube. The experimental result of frictional pressure drop gradient and heat transfer coefficient for the grooved tube were compared with the predicted values by some available correlations. The Murata correlation for the friction pressure drop gradient gives more accurate values than other correlations assessed in the present study. Three available correlations, Murata, Momoki et al. and Mori et al., for flow boiling heat transfer coefficients inside grooved copper tubes were examined with the measured heat transfer coefficients. Also for the heat transfer coefficient, the Murata correlation showed the better agreement than the other two correlations against the present measured values.
長崎大学の論文