摘要
对水平环缝内冷水自然对流换热性能进行了实验研究。水平环缝宽度为6～18mm,外壁温度维持0℃,换热温差为2～24℃。结果表明,在实验范围内,内壁面的平均表面传热系数随环缝宽度的增大而增加;当温差小于4℃或大于8℃时,平均表面传热系数随温差的增大而增大,在4～8℃范围内,随温差的增大而减小。采用逐步线性回归方法,得到了内壁传热关联式。
This paper conducts the experimental study on the natural convection characteristics of cold water near the maximum density in horizontal annulus with the fixed inner radius ri = 14 mm and different width l =6-18 mm. The temperature at outer wall is maintained at 0 ℃, and the temperature differences between the inner and outer walls range from 2 to 24℃. The results show that the heat transfer coefficient at inner wall increases with the increase of the annulus width. When the temperature difference is bellow 4 ℃ or above 8 ℃, the heat transfer coefficient increases with the increase of the temperature difference. When the temperature difference is between 4℃ and 8 ℃, it decreases with the increase of the temperature difference. The formula of heat transfer at inner walls is obtained by using the method of linear regression.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第10期1165-1168,共4页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50976129)
国家大学生创新性实验项目(CQUCX-G-2007-29)
关键词
自然对流
传热特性
水平环缝
natural convection heat transfer
horizontal annulus
