滴状凝縮伝熱機構に関する研究 : 第2報,低圧における水の凝縮係数

概要

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Though an apparent difference in the number density of microscopic drops existed between gold and chromium condenser surfaces used, the heat-transfer coefficient was found to be almost of the same value. Then the distributions of drops by sizes down to 1μm in radius were experimentally determined. For the gold condenser surface on which small drops seemed to be densely populated, the measured drop-size distribution showed a satisfactory agreement with the theoretical prediction in the so-called equilibrium region of small drops. On the other hand, for the chromium surface, the number density of drops smaller than 7μm deviated clealy downward. Integrating the measured drop-size distribution weighted with the substantial condensation rate onto each droplet yields a heat-transfer coefficient, which should coincide with the actually measured one. From the comparison of the data for the both condenser surfaces, it is concluded that the condensation coefficient of water at pressures 1 and 3 kPa is 0.4.
一般社団法人日本機械学会の論文
1986-05-25