水平管内低压蒸汽冷凝.pdf

　第 54 卷 　第 7 期 　 　化 　　　工 　　　学 　　　报 　　　 　　　　Vol54 　№7 ( ) 　 2003 年 7 月 　 　Journal 　of 　Chemical 　Industry 　and 　Engineering 　 China 　 　July 　2003 研究论文 水平管内低压蒸汽的冷凝 尹 　铭 　 陈嘉宾 　马学虎 　李凇平 (大连理工大学化学工程研究所 , 辽宁 大连 116012) 摘 　要 　对水平管内低压蒸汽冷凝现象进行了实验研究. 考察了冷却水流量 、温度恒定条件下热流密度 、蒸汽 压力 、蒸汽流速对冷凝传热膜系数及总传热系数的影响关系 , 同时考察了总传热温差 、蒸汽进出口温差及压降 随热流密度变化的关系. 关联出了相应的水平管内冷凝传热膜系数的计算式 , 计算值与实测值的偏差在 ±15 %以内. 关键词 　低压 　冷凝 　水平管 中图分类号 　O 642 　　　　　　　文献标识码 　A 文章编号 　0438 - 1157 (2003) 07 - 0913 - 05 COND EN SATION OF LOWPR E S SUR E VAPOR IN HORIZON TAL TUB E YIN Ming , CHEN J iabin , MA Xuehu and LI Songping ( Institute of Chemical Engineering , Dalian University of Technology , Dalian 116012 , L iaoning , China) Ab stract 　The phenomenon of condensation of lowpressure vapor in a horizontal tube was studiedThe interactions between heat flux density , vapor pressure , vapor velocity and the coefficient of heat transfer for filmwise condensation in the tube , the overall coefficient of heat transfer were investigated . The relationship s between heat flux density and the overall temperature difference , the difference in temperature and pressure drop at the entrance and the exit of the vapor were investigated as well Analytical relationship s were obtained for calculation of the coefficient of heat transfer for filmwise condensation in the tubeThe deviation between the experimental value and the calculated value was lower than ±15 % Keyword s 　low pressure , condensation , horizontal tube