• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (24): 142-146.doi: 10.3901/JME.2016.24.142

• 可再生能源与工程热物理 • 上一篇    下一篇

横纹槽管内插扭带复合强化传热的试验研究*

雷诗毅1, 郭亚军1, 桂淼2, 毕勤成2   

  1. 1. 西安建筑科技大学环境与市政工程学院 西安 710055;
    2. 西安交通大学动力工程多相流国家重点实验室 西安 710049
  • 出版日期:2016-12-15 发布日期:2016-12-15
  • 作者简介:

    雷诗毅,女,1991年出生。主要研究方向为新型节能环保换热器。

    E-mail:lsy1613@126.com

  • 基金资助:
    * 国家科技支撑计划资助项目(2012BAA12B02); 20160513收到初稿,20161017收到修改稿;

Experimental Study on Compound Heat Transfer Enhancement of Transverse Corrugated Tube with Full Length Twisted Tapes

LEI Shiyi1, GUO Yajun1, GUI Miao2, BI Qincheng2   

  1. 1. School of Environmental and Municipal Engineering,Xi’an University of Architecture &Technology, Xi’an 710055
    , 2. State Key Laboratory of Multiphase Flour in Power Engineering, Xi’an Jiaotong University, Xi’an 710049
  • Online:2016-12-15 Published:2016-12-15

摘要:

不同强化传热方式的复合会产生不同的传热效果,通过试验将不同扭率的扭带与同一规格横纹槽管复合强化传热的效果进行对比。试验以高黏度的导热油为工质,在500<Re<7 000、50<Pr<180的参数范围内,研究复合强化管的Nu数和阻力系数f随着Re数的变化情况,通过多元线性回归得到Nu数和f的关联式,并以强化传热性能评价指标(Performance evaluation criteria,PEC)值为标准评价其综合换热性能。结果表明:相同扭率下,复合强化管的阻力系数是光管内插扭带阻力系数的2~5倍,Nu数是光管内插连续扭带的1~4倍。随着Re数的增加,扭率Y对复合强化管的Nu数值影响越来越小。层流工况下,复合强化管的综合换热性能指标PEC值随Re数的增加而增加,且与扭率Y成负相关;过渡流工况下,复合强化管的PEC值都随Re数的增加而减小,扭率Y为5.21时的复合强化管综合换热效果最好。

关键词: PEC, 复合强化传热, 扭带, 阻力系数, 横纹槽管

Abstract:

The different mode of compound heat transfer enhancement leads to different transfer effect. Experimental studies of comparison between different compound transfer enhancement effects on transverse corrugated(TC) tube with full-length twisted tapes of different twist ratios have been conducted with oil of high viscosity. The variation of Nusselt number and resistance coefficient with Reynolds numbers are presented, and then correlation for Nusselt number and resistance coefficient are obtained by a multivariable linear regression analysis in the range of 500<Re<7 000, 50<Pr<180. Comprehensive heat transfer performance is evaluated by the value of performance evaluation criteria. As compared with smooth tubes with full-length twisted tapes, the resistance coefficient of TC tubes with full-length twisted tape inserts can be increased by 2-5 times, theNu can be increased by 1-4 times. With the increasing ofRe, the twist ratios are less able to influence theNu. Values of PEC of TC tubes with full-length twisted tape inserts in proportion ofRe and in inverse proportion of twist ratios on the condition of laminar flow. Under the condition of transition flow, the values in inverse proportion ofRe. In addition, TC tube with twisted tape ofY=5.21 inserts has better comprehensive heat transfer performance than the others.

Key words: compound transfer enhancement, PEC, resistance coefficient, twisted tapes, transverse corrugated tube