水平环缝内冷水自然对流换热实验  

Experimental study on natural convection of cold water near the maximum density in horizontal annulus

作　　者：唐经文[1] 王林豪[1] 高诚[1] 梁鑫俐 李佳[1] 

机构地区：[1]重庆大学动力工程学院,重庆400030 [2]重庆元隆装饰设计工程有限公司,重庆400010

出　　处：《重庆大学学报（自然科学版）》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)

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.

关 键 词：自然对流 传热特性 水平环缝 

分 类 号：TK124[动力工程及工程热物理—工程热物理]