摘要
为提高降膜流动过程中的传热效率,搭建水平降膜传热性能测试装置,以水为系统循环工质,实验研究热流密度(0—5582 W/m 2)、喷淋密度[0.14—4.16 kg/(m·s)]和喷淋温度(20—40℃)对单根半椭圆管水平降膜管外传热系数分布和变化规律,并与相同管截面外周长圆管、椭圆管对比。结果表明:随着热流密度、喷淋密度和喷淋温度的增加,半椭圆管水平降膜管外平均传热系数不断增大,喷淋密度较小时,传热系数增加速率更大;沿管管截面圆周向角方向,半椭圆管、椭圆管和圆管的水平管外降膜传热系数变化趋势基本一致,先明显减小,最后略微增大;半椭圆管比圆管、椭圆管的水平降膜管外平均传热系数更高,具有重要的工程应用价值。
In order to improve heat transfer coefficient in falling film flow process,a horizontal falling film heat transfer performance test device was set up and water was used as circulating medium of system.The influence of different heat flux(0-5582 W/m 2),spray density(0.14-4.16 kg/(m·s))and spray temperature(20-40℃)on heat transfer coefficient distribution and variation outside a single semi-elliptic horizontal tube was studied.The results were compared with circular tube and elliptic tube under same outer section circumference.It shows that with increases of heat flux,spray density and spray temperature,average falling film heat transfer coefficient outside semi-elliptic horizontal tube increases and heat transfer coefficient increases more rapidly at lower spray density.Along circumferential direction of tube section,variation trend of heat transfer coefficient semi-elliptic tube,elliptic tube and circular tube is basically the same,which decreases significantly at first and increases slightly at last.Compared with circular tube and elliptic tube,semi-elliptic tube has higher average heat transfer coefficient.The structure of semi-elliptic tube is valuable in industrial application.
作者
王树信
周亚素
胡昊
颜子雄
WANG Shu-xin;ZHOU Ya-su;HU Hao;YAN Zi-xiong(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)
出处
《化学工程》
CAS
CSCD
北大核心
2020年第5期37-41,53,共6页
Chemical Engineering(China)
关键词
半椭圆管
水平降膜
传热系数
热流密度
喷淋密度
喷淋温度
semi-elliptic tube
horizontal falling film
heat transfer coefficient
heat flux
spray density
spray temperature
作者简介
王树信(1993—),男,硕士研究生,主要从事高效低阻节能降耗装备研究,E-mail:sx_wang@foxmail.com;通信联系人:周亚素(1964—),女,教授,博士生导师,主要从事降膜蒸发、热泵研究,E-mail:zhouys@dhu.edu.cn。
