化工进展 ›› 2020, Vol. 39 ›› Issue (4): 1259-1266.DOI: 10.16085/j.issn.1000-6613.2019-1267

• 化工过程与装备 • 上一篇    下一篇

单相自然循环回路的强化对流传热特性

曾龙(),雷海燕,戴传山()   

  1. 天津大学中低温热能高效利用教育部重点实验室,天津 300350
  • 收稿日期:2019-08-06 出版日期:2020-04-05 发布日期:2020-04-28
  • 通讯作者: 戴传山
  • 作者简介:曾龙(1995—),男,硕士研究生,研究方向为强化传热和数值计算。E-mail:zenglong@tju.edu.cn
  • 基金资助:
    国家自然科学基金(41574176)

Heat transfer performance of a convection-enhanced heat transfer element——single-phase natural circulation loop

Long ZENG(),Haiyan LEI,Chuanshan DAI()   

  1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, Tianjin 300350, China
  • Received:2019-08-06 Online:2020-04-05 Published:2020-04-28
  • Contact: Chuanshan DAI

摘要:

通过实验对比分析了带有单相自然循环回路元件的铜板与光滑铜板相隔冷热空气逆流换热的换热效果。 结果表明,相同泵耗功情况下,加装单相自然循环回路元件的换热板的换热量是光滑铜板的1.1~1.3倍。在此基础上,本文通过数值模拟进一步对比分析了加装单相自然循环回路元件与相同形状、尺寸的铜翅片换热效果,针对影响自然循环回路传热性能的主要因素,如循环回路高度、横向与轴向倾斜角度、冷热源温差等,进行了数值模拟研究。结果表明:只有当温差超过等效温差点后,自然循环回路元件的换热效果才强于相同形状和尺寸的铜翅片;随着几何尺寸减少以及倾斜角度的增加,自然循环元件与铜翅片的等效温差点随之升高。

关键词: 单相自然循环回路, 强化传热, 数值模拟, 换热性能, 强化传热比

Abstract:

The heat transfer performance for a copper plate installed with single-phase natural circulation loop (SPNCL) was experimentally and numerically studied. Firstly, the heat transfer experiments between hot and cold air steams flow counter-currently in a rectangular channel separated by a copper plate installed with SPNCLs and a smooth copper plate were conducted, respectively. The results showed that, at the same power consumption, the heat transfer rate of the copper plate with SPNCLs is about 1.1—1.3 times as large as that of the smooth copper plate. In addition, the numerical simulations were performed for a comparison between the heat transfer rates of the SPNCL and the copper fin with the same shape and size. The effects of size, inclination angle and temperature difference between hot and cold air on the heat transfer rate were investigated in detail. The results showed that the heat transfer rate of the SPNCL can only be larger than that of the copper fin while the temperature difference is over an equivalent temperature difference. With the decrease of size and the increase of the inclination angle, the equivalent temperature difference between the SPNCL and the copper fin increases.

Key words: single-phase natural circulation loop, enhanced heat transfer, numerical simulation, heat transfer capability, enhanced heat transfer ratio

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn