化工学报 ›› 2020, Vol. 71 ›› Issue (S2): 92-97.DOI: 10.11949/0438-1157.20200556

• 流体力学与传递现象 • 上一篇    下一篇

磁场对熔盐射流冲击传热的影响

高峰(),陈永昌(),赵金龙,马重芳   

  1. 北京工业大学环境与能源工程学院,传热强化与过程节能教育部重点实验室,传热与能源利用北京市重点实验室,北京 100124
  • 收稿日期:2020-05-11 修回日期:2020-06-15 出版日期:2020-11-06 发布日期:2020-11-06
  • 通讯作者: 陈永昌
  • 作者简介:高峰(1988—),男,硕士,844383354@qq.com
  • 基金资助:
    国家自然科学基金项目(51276004)

Influence of magnetic field on jet impingement heat transfer with molten salt

Feng GAO(),Yongchang CHEN(),Jinlong ZHAO,Chongfang MA   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, Beijing 100124, China
  • Received:2020-05-11 Revised:2020-06-15 Online:2020-11-06 Published:2020-11-06
  • Contact: Yongchang CHEN

摘要:

以永磁铁构建定磁场,进行外加磁场作用下熔盐射流冲击传热的实验研究,并得到Nusselt数Nu驻点关联式和径向分布。结果表明,在驻点区范围内,Nusselt数较无磁场作用时增大,传热得到比较明显的增强,而在壁面射流区,这种强化传热效果逐渐减弱。此外,当Reynolds数Re一定时,熔盐Nusselt数随着磁场强度的增加而增大,且驻点处强化传热效果最为显著。在Reynolds数Re=6400与磁场强度B=2800 Gs条件下,熔盐驻点Nusselt数Nu0提高约6%,可见磁场作用对熔盐射流冲击传热具有一定的强化效果。

关键词: 熔盐, 射流冲击, 驻点, 磁场, 强化传热

Abstract:

Experimental study of jet impingement heat transfer with molten salt under the influence of external constant magnetic field was generated by permanent magnets. Both stagnation correlation and radial distribution of Nusselt number under magnetic field were obtained. The results showed that the Nusselt number with magnetic field became higher than that without magnetic field at stagnation region and jet impingement heat transfer was comparatively enhanced, while in wall jet region, the enhancement of heat transfer was gradually weakened. In addition, when the Reynolds number was constant, the Nusselt number of molten salt increased with increasing of the intensity of magnetic field, and the most enhanced heat transfer existed at the stagnation point. Under the conditions of Reynolds number Re=6400 and the intensity of magnetic field B=2800 Gs, the stagnation Nusselt number of molten salt was about 6 % higher than that without magnetic field. It can be seen that the magnetic field may promote the jet impingement heat transfer of molten salt.

Key words: molten salt, jet impingement, stagnation point, magnetic field, heat transfer enhancement

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