壁面过冷度对水平管内含空气蒸汽冷凝换热影响  

Effects of Wall Sub-Cooling on Local Heat Transfer for Forced Convection Condensation of Steam/air in A Horizontal Tube

作　　者：徐慧强 孙秋南 谷海峰 李昊 孙中宁 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001 [2]哈尔滨工程大学能源与动力工程学院,哈尔滨150001

出　　处：《核动力工程》2016年第1期43-47,共5页Nuclear Power Engineering

摘　　要：为研究壁面过冷度对含不凝性气体蒸汽流动冷凝换热能力的影响,分别进行水冷却与空气冷却条件下空气-蒸汽混合气在水平管内的流动冷凝实验,分析空气入口质量分数,混合气入口流速以及管外冷却剂体积流量变化时,管内局部换热系数随壁面过冷度的变化规律。结果表明:在环状流及波状流范围内,局部换热系数随壁面过冷度的增加而增大;在分层流范围则随壁面过冷度的增加而减小;空气含量与混合气流速的增加,会使得环状流和波状流下壁面过冷度增大对冷凝换热能力的促进作用更为显著。For the purpose of analyzing the effects of wall sub-cooling on the heat transfer characteristics of forced convection condensation for steam/air mixtures in a horizontal tube, the experiments under air-cooling and water-cooling have been conducted. By comparing the experimental data for different inlet air mass fractidns, mixtures velocities and coolant volume flow rates, the variation of local heat transfer coefficient with wall sub-cooling was obtained. The results show that for annular and wavy flow, the condensation heat transfer coefficient increases with wall sub-cooling while decreases with wall sub-cooling for stratified flow. The positive effects of the increasing wall sub-cooling on the condensation heat transfer coefficient is enhanced with the rise of inlet air mass fraction and mixture g ases velocity for annular and wavy flow.

关 键 词：水平管 含空气蒸汽 流动冷凝 壁面过冷度 局部换热系数 

分 类 号：TL33[核科学技术—核技术及应用]