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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

NUMERICAL SIMULATIONS OF FLOW AROUND A SQUARE CYLINDER AT LOW REYNOLDS NUMBER WITH STREAMWISE MAGNETIC FIELDS

Long Chen
School of Engineering Sciences, University of Chinese Academy of Sciences.

Ming-Jiu Ni
Laboratory of Liquid Metal Modeling for Multiphysical Fluid Mechanics (LLiMM-MFM), School of Physics, University of Chinese Academy of Sciences, Beijing 101408, China

DOI: 10.1615/IHTC16.hte.023207
pages 5525-5536


SCHLÜSSELWÖRTER: Heat transfer enhancement, MHD and plasma, vortex inversion, Von Karman vortex street

Abstrakt

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 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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