【作者】 吴玲飞； 梅元贵； 许建林； 武振锋；

【Author】 WU Lingfei, MEIYuangui, XU Jianlin, WU Zhenfeng (Institute of Thermal and Power Engineering, Lanzhou Jiaotong University,Lanzhou 730070)

【机构】 兰州交通大学热能与动力工程研究所；

【摘要】 利用萘升华传质/传热比拟实验原理,研究了在椭圆管面积相等条件下,雷诺数在500～3500,不同椭圆管形状对平片换热芯片传热特性的影响;分析了同一椭圆管形状在不同片间距下以及在同一片间距下不同椭圆管形状平片换热芯片的传热特性。结果表明,对给定的雷诺数Re,Sh数随着片间距的增大而增大;对不同椭圆管形状的换热芯片,在同一片间距及雷诺数Re下,椭圆管长短轴之比b／a=1．5时传热特性最好。更多还原

【Abstract】 The paper investigates the effect of heat transfer characteristics of plate fin and elliptic tube heat exchanger element with the same elliptic tube area by the heat and mass transfer analogy in conjunction with the naphthalene sublimation technique. The range of testing Reynolds number is from 500 to 3500.The present study evaluates the heat transfer performance on the condition of the variation of fin pitch and elliptic tube shape. The results show that for the given Re, Sh increase with the increase of fin pitch; For the different elliptic tube element, the heat transfer characteristic of b/a=l .5 is the best with the same fin pitch and Re.更多还原