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山东大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (1): 90-94.doi: 10.6040/j.issn.1672-3961.0.2013.182

• 其他 • 上一篇    

渗层不锈钢管束表面真空下换热特性的实验分析

程屾, 孙奉仲*   

  1. 山东大学能源与动力工程学院, 山东 济南 250061
  • 收稿日期:2013-06-21 出版日期:2014-02-20 发布日期:2013-06-21
  • 通讯作者: 孙奉仲(1962-),男,山东郓城人,教授,博导,博士,主要研究方向为电站热力设备节能与经济性控制.E-mail:sfz@sdu.edu.cn E-mail:sfz@sdu.edu.cn
  • 作者简介:程屾(1982- ),男,山东济南人,博士研究生,主要研究方向为电站热力设备节能与经济性控制.E-mail:jereff@126.com
  • 基金资助:

    山东省科技发展计划基金资助项目(2012GGE27012)

Experimental analysis of condensation heat transfer characteristics under vacuum condition of Nickel based implanted tube bundle

CHENG Shen, SUN Feng-zhong*   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • Received:2013-06-21 Online:2014-02-20 Published:2013-06-21

摘要:

为了探究在真空条件下材料表面特性对蒸汽凝结换热的影响机理,从实验和凝结理论两个方面入手探索了在真空条件下渗层不锈钢管束壁面蒸汽凝结的换热特性。在真空条件下进行对比实验,实验结果表明,渗层不锈钢管束的凝结换热性能明显优于普通铜管束,且随着真空的提高,效果更为显著,最高提升幅度可达77%。进而从真空对蒸汽的流场、非冷凝气体的热阻及其固相和液相间的界面能差三个部分论证了真空度的提升有利于冷凝液滴的形成和凝结换热效果的提升,与实验结果相符。

关键词: 真空度, 强化传热, 换热管束, 凝结传热系数, 总体传热系数

Abstract:

The steam condensation heat transfer characteristics of Nickel based implanted tube bundle was studied though comparative experiments and theoretical analysis for exploring effect mechanism on steam condensation heat transfer by surface material characteristics. The results showed that the Nickel based implanted tube bundle had a better performance than common copper tube, especially in a higher vacuum state, the maximum enhance rate was up to 77%. The theoretical research was carried on by analyzing the flow of steam, noncondensed gas thermal resistance and solidliquid interfacial energy, it turned out that dropwise condensation was easily generated under lower pressure and its heat transfer coefficient increased with a rising vacuum, consistent with the subsequent experimental results.

Key words: condensation heat transfer coefficient, overall heat transfer coefficient, tube bundles,  heat transfer enhancement

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