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
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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
Ming-Jiu Ni
中科院分区:
工程技术2区
文献类型:
--
作者:
Long Chen;Shi-Jing Xu;Ming-Jiu Ni

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本文采用三维数值模拟的方法,对方柱绕流中的卡门涡街反转现象进行了研究。本文旨在分析涡旋逆温的成因,并探讨其物理机制。壁面约束和来流条件作为两个独立的反演因素得到了更为严格的证明。结果表明,主涡与来流或壁面涡层的相互作用是产生这种现象的根本原因。为了比较反转和非反转情况之间的热传输现象,通道的顶壁保持在自由流温度,并且底壁被设置为加热,同时圆柱体保持绝热。结果表明,在实验条件下,管内的反向现象不利于传热。此外,还考虑了流向磁场对涡街反转的影响。
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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