石油化工高等学校学报

石油化工高等学校学报 ›› 2008, Vol. 21 ›› Issue (1): 51-54.

• 化工机械 • 上一篇    下一篇

考虑结垢传质时管内紊流对流换热系数的确定

吴双应, 苏 畅, 李友荣   

  1. 重庆大学动力工程学院,重庆400044
  • 收稿日期:2007-07-16 出版日期:2008-03-20 发布日期:2017-06-28
  • 作者简介:吴双应(1968-),男,安徽桐城市,副教授,博士。
  • 基金资助:
    重庆市自然科学基金项目(CSTC,2006BB6226)。

 
The Determination of Turbulent Convective Heat Transfer Coefficient Through a Duct Considering Fouling Mass Transfer Process

WU Shuang-ying, SU Chang, LI You-rong   

  1. College of Power Engineering, Chongqing University, Chongqing 400044, P. R. China
  • Received:2007-07-16 Published:2008-03-20 Online:2017-06-28

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摘要： 从热质传递的薄膜理论出发,结合Kern和Seaton提出的渐近污垢模型,研究在紊流状态下污垢形成
阶段管内的对流换热特性,得到在考虑结垢传质过程条件下管内紊流对流换热系数的计算式。研究结果表明,污垢
的沉积使总的对流换热系数随时间的推移逐渐下降最后趋于一定值,与没有污垢时的情况相比,在污垢形成的初始
阶段出现换热增强的现象,但此效果并不明显,且污垢对管内对流换热效果受到管径、管壁温、流速及流体入口温度
等因素的影响。

关键词: 薄膜理论   ,   , 污垢  ,   , 对流换热  ,   , 传热传质

Abstract:  

Based on the combination of thin film model reflecting heat and mass transfer synchronously with the asymptotic fouling model proposed by Kern and Seaton, the convective heat transfer characteristic through a duct under turbulent flow conditions at the forming period of fouling was investigated and a quantitative expression of the turbulent convective heat transfer coefficient through a duct considering fouling mass transfer process was presented. The results show that the deposition of fouling makes the whole convective heat transfer coefficient is decrease gradually with time and close to a constant. Compared with a clean duct, the heat transfer at the initial forming period of fouling is enhanced, but this phenomenon is not obvious. Furthermore, the whole convective heat transfer coefficient is determined by duct diameter, duct wall temperature, flow velocity, and inlet temperature of fluid, etc.

Key words: Thin film theory   ,   , Fouling   ,   , Convective heat transfer  ,    , Heat and mass transfer

引用本文

吴双应, 苏 畅, 李友荣. 考虑结垢传质时管内紊流对流换热系数的确定[J]. 石油化工高等学校学报, 2008, 21(1): 51-54.

WU Shuang-ying, SU Chang, LI You-rong.  

The Determination of Turbulent Convective Heat Transfer Coefficient Through a Duct Considering Fouling Mass Transfer Process
[J]. Journal of Petrochemical Universities, 2008, 21(1): 51-54.

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