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

doi:10.11949/0438-1157.20200556

Abstract

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

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

CLC Number:

TK 124

Feng GAO, Yongchang CHEN, Jinlong ZHAO, Chongfang MA. Influence of magnetic field on jet impingement heat transfer with molten salt[J]. CIESC Journal, 2020, 71(S2): 92-97.

高峰, 陈永昌, 赵金龙, 马重芳. 磁场对熔盐射流冲击传热的影响[J]. 化工学报, 2020, 71(S2): 92-97.

Figures/Tables 4

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