【摘要】 针对入口压力为0.20～0.50 MPa的饱和蒸汽在20～70℃过冷水中超音速浸没射流凝结换热进行了实验研究。结果表明入口蒸汽压力和过冷水温度是影响汽羽形状的主要因素。分子动力学理论得到的凝结换热系数在0.16～1.91 MW/(m~2·℃)之间,随着过冷水温度的增加而增加;湍流强度理论得到的凝结换热系数在0.68～1.68 MW/(m~2·℃)之间,随着过冷水温度的增加基本不变;对流换热理论得到的凝结换热系数在1.47～2.11 MW/(m~2·℃)之间,随着过冷水温度的增加先增大后减小。更多还原

【Abstract】 The condensation heat transfer of supersonic steam jet immerged in subcooled water was investigated.The inlet steam pressure and subcooled water temperature were in the range of 0.2～0.5 MPa and 20～70℃,respectively.The results indicated that the shape of steam plume was influenced by the inlet steam pressure and subcooled water temperature.Moreover,three models were used to analyze the condensation heart transfer.According to the molecule kinetics theory,the condensation heat transfer coefficient was in the range of 0.16～1.91 MW/(m~2·℃),and tended to increase as the subcooled water temperature increased.The condensation heat transfer coefficient was in the range of 0.68～1.68 MW/(m~2·℃) according to the turbulence intensity theory,and was independent of the water temperature.The condensation heat transfer coefficient was in the range of 1.47～2.11 MW/(m~2·℃) according to the convection heat transfer theory,and increased first then decreased with the water temperature.更多还原