The Kármán vortex street inversion and heat transfer around a square cylinder at low Reynolds and magnetic interaction numbers
The Kármán vortex street inversion and heat transfer around a square cylinder at low Reynolds and magnetic interaction numbers
复制标题
低雷诺数和磁相互作用数下方圆柱体周围的卡门涡街反演和传热
DOI:
10.1016/j.ijheatmasstransfer.2017.10.040
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发表时间:
2018-02
影响因子:
5.2
通讯作者:
Ming-Jiu Ni
中科院分区:
文献类型:
--
作者:
Long Chen;Shi-Jing Xu;Ming-Jiu Ni
Three-dimensional numerical simulations, for confined flows and unconfined flows, have been carried out to study the Kármán vortex street inversion in the wake of a square cylinder. This paper is aimed to analyze the cause of the vortex inversion and to investigate the physical mechanisms. As two independent factors for the inversion, the wall confinement and the incoming flow conditions have been proved in a more rigorous way. It is shown that the interaction between the primary vortex and the incoming flow or the wall vortex layer is the fundamental cause. In order to compare the thermal transport phenomenon between the inversion and non-inversion cases, the top wall of a channel is kept at the free stream temperature and the bottom wall is set heated, while the cylinder is maintained adiabatic. The results indicate that the inversion phenomenon is not good for the heat transfer. Additionally, the effects of streamwise magnetic field on the vortex street inversion has been considered.
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