E112 BOILING HEAT TRANSFER AND CHF OF FORCED FLOW OF SUBCOOOLED WATER AND AIR MIXTURE(Critical heat flux)
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概要
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The effect of air injection into a subcooled water flow on boiling heat transfer and a critical heat flux (CHF) was examined experimentally. Experiments were conducted in the range of subcooling of 50 K, a superficial velocity of water and air U_1 = 0.17 〜 5.2 and U_g = 0 〜 25 m/s, respectively. A test heat transfer surface was a 5 mm wide, 40 mm long and 0.5 mm thick stainless steel sheet embedded on the bottom wall of 10 mm high and 20 mm wide rectangular flow channel. The heat transfer coefficient was enhanced approximately nine times in the non-boiling region by introducing the air flow. The heat transfer improvement was prominent when the water flow rate was low and the air injection rate was large. The general trend of the obtained heat transfer coefficient was predicted qualitatively well by the Dengler-Addoms correlation for the forced convection evaporation heat transfer. However, the measured was 50 % larger than the predicted. In the boiling region, the air introduction had some effects on the augmentation of the heat transfer when the water flow rate was low, the air introduction rate was large, and the wall superheat was low. However, the two-phase flow effect was little in the fully developed boiling region and the boiling was dominant. The CHF was improved a little by the air injection when the water flow rate was high. However, in the low water flow rate region, the CHF was rather reduced by the air injection.
- 一般社団法人日本機械学会の論文
- 2000-10-01
著者
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Koizumi Yasuo
Department Of Mechanical Engineering Kogakuin University
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Ohtake Hiroyasu
Department Of Mechanical Engineering Kogakuin University
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Yuasa Tomohiro
Department of Mechanical Engineering Kogakuin University
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