U型并联多通道中流量分配特性

高增益包层并联多通道流量分配特性直接影响其传热效率,在初始设计中,缺少简洁有效的设计方法。采用Fluent程序对U型布置并联多通道的流量分配特性进行数值模拟,通过敏感性分析,确定了影响流量分配特性的支管长度、支管横截面积、支管个数以及总管横截面积等重要参数,提出了预估流量分配特性的方法。分析表明,无量纲参数Kfd越低,流量分配越均匀；当Kfd低于0.03时,流量丧失比低于5%。

Characteristics of flow distribution in U-type parallel tubes

The heat transfer efficiency in high-multiplication water-cooled solid breeder is directly affected by the characteristics of the flow distribution in parallel tubes, however, there are no simple and effective methods for the initial design of the parallel tubes. The characteristics of flow distribution in U-type parallel tubes are simulated by Fluent program, and the sensibilities of geometry parameters and Reynolds number of the tube are analyzed. After that, the key parameters that affect the characteristics of flow distribution are obtained, including the channel length, channel area, number of channels as well as manifolds area. And a method for predicting characteristics of flow distribution is provided. Analysis results show that the lower the dimensionless factor Kfd is, the better the characteristics of flow distribution is. When Kfd is lower than 0.03, the flow loss ratio will be less than 5%.