化工学报 ›› 2012, Vol. 63 ›› Issue (3): 713-720.DOI: 10.3969/j.issn.0438-1157.2012.03.006

• 流体力学与传递现象 • 上一篇    下一篇

扭曲椭圆管换热的壳程强化传热特性

谭祥辉,孙赫,张立振,朱冬生   

  1. 华东理工大学机械与动力工程学院,承压系统与安全教育部重点实验室
  • 收稿日期:2011-08-02 出版日期:2012-03-05 发布日期:2012-03-05
  • 通讯作者: 朱冬生

Shell side heat transfer enhancement in twisted elliptical tube heat exchanger

TAN Xianghui, SUN He, ZHANG Lizhen, ZHU Dongsheng   

  • Received:2011-08-02 Online:2012-03-05 Published:2012-03-05
  • Contact: Xianghui TAN

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

Abstract:  Heat transfer and pressure drop of twisted elliptical tube heat exchanger with FrM=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 FrM>232 and FrM=64 is analyzed, and correlations of the tested heat exchanger with FrM=79 are derived. The testing result indicates that there exists a change of fluid flowing state when Res 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

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