Abstract:  Heat transfer and pressure drop of twisted elliptical tube heat exchanger with Fr_M=79 are tested in the present work. Based on the experimental result, the application range of previous correlations for twisted elliptical tube heat exchanger with Fr_M>232 and Fr_M=64 is analyzed, and correlations of the tested heat exchanger with Fr_M=79 are derived. The testing result indicates that there exists a change of fluid flowing state when Re_s increases to 8000. Two heat exchangers with similar geometric parameters to the tested one but supported by segmental baffles and rod baffles are designed. Their shell side heat transfer coefficients and pressure drops are calculated with Bell-Delaware method and Gentry’s method, respectively. Heat transfer coefficients and pressure drops of the two designed heat exchangers are compared with the tested twisted elliptical tube heat exchanger. Comprehensive performance of the three heat exchangers is studied. The twisted elliptical tube heat exchanger gives the highest heat transfer coefficient and lowest pressure drop. This type of heat exchanger has the advantages of segmental heat exchanger and rod baffle heat exchanger and will be widely used in the industry.

Key words: twisted elliptical tube heat exchanger, shell side heat transfer coefficient, shell side pressure drop, comprehensive performance

摘要： 通过搭建扭曲椭圆管换热器壳程传热与压降性能测试平台，对扭曲椭圆管换热器壳程传热与压降性能进行了实验测试，以实验数据为基础对前人得到的壳程传热与压降性能计算准则关系式的应用范围进行了分析，同时拟合得到了测试用扭曲椭圆管换热器壳程传热与压降性能计算准则关系式，设计了与测试扭曲椭圆管换热器结构类似的折流板换热器以及折流杆换热器，采用相关计算方法对换热器的传热与压降性能进行了计算和比较，并分析了3台换热器的综合性能，结果显示扭曲椭圆管换热器传热效果好、压降低，具有很好的工业应用前景。

关键词: 扭曲椭圆管换热器, 壳程传热膜系数, 壳程压降, 综合性能