扭曲椭圆管管内传热与压降性能的研究  

Heat transfer and pressure drop performances of twisted oval tubes

作　　者：朱冬生[1] 谭祥辉[1] 曾力丁[1] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统安全与科学教育部重点实验室,上海200237

出　　处：《化学工程》2013年第1期9-14,共6页Chemical Engineering(China)

摘　　要：通过建立扭曲椭圆管单管传热与压降性能测试平台,利用光滑圆管,对测试平台测试结果的准确性进行了验证,同时对扭曲椭圆管的传热以及压降性能进行了实验测试,以测试结果为基础,验证了数值计算模型的准确性。对不同几何尺寸的扭曲椭圆管单管传热与压力性能进行了数值计算,分析了换热管几何参数对传热与压降性能的影响,结果显示:扭曲椭圆管传热性能随着扭曲椭圆管长短轴比A/B的增大而增大,随着扭曲椭圆管扭距S的减小而增大。同时以数值计算结果为基础,拟合得到了8×103<Re<4×104,11.49<S/dh<19.84,1.65<A/B<3.11范围内的传热因子以及摩擦系数计算通用准则关系式。为扭曲椭圆管换热器在工程实际中的应用提供了数据基础。An experimental system for testing the heat transfer and pressure drop performances of twisted oval tube was established, and its reliability was verified with a smooth round tube. Then, the heat transfer and pressure drop performances of a twisted oval tube were tested with the system. Based on the experimental result, the turbulent model and grid system for numerically studying the heat transfer and pressure drop performances of twisted tubes were confirmed. The performances of twisted oval tubes with different geometrical parameters were obtained numerically. The influences of geometrical parameters such as axis ratio A/B and twist pitch S on the performances of the tubes were also analyzed. The experimental result shows that the testing system and the data reduction method are reliable. The numerical result shows that the bigger the A/B is, the higher the heat transfer factor and friction factor are, the smaller the S is, and the higher the heat transfer factor and friction factor are. The correlations for calculating the heat transfer factor and friction coefficient in the range of 8 × 103 〈 Re 〈 4 ×104, 11.49 〈 S/dh 〈 19.84,1.65 〈A/B 〈3.11 are also fitted based on the numerical calculation results. The correlations provide a database for the designing and application of twisted oval tube heat exchanger in the industry.

关 键 词：扭曲椭圆管 传热特性 压降特性 准则关系式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]