Numerical study on heat transfer enhancement in the flow around a cylinder near a vibrating heated plate under a magnetic field

doi:10.7523/j.ucas.2025.034

Abstract

Abstract: This work investigates the flow of liquid metals around a near-wall cylinder and the enhancement of heat transfer under a magnetic field through numerical simulations. It analyzes the physical mechanisms of influence of the magnetic field, the amplitude of the vibrating plate, the heat flux and gap ratio(G/D) on flow structure and heat transfer. The results indicate that the Lorentz force drives the vortex toward the heated plate. As the magnetic field increases, the vortex shedding behind the cylinder exhibits a trend of initially promoting and then suppressing, resulting in a non-monotonic variation in heat transfer efficiency, which first increases and then decreases. Increasing the amplitude of the heated plate enhances the velocity disturbance between the cylinder and the plate, which reduces the thickness of the temperature boundary layer, thereby significantly improving the heat transfer. The changes in heat flux and gap ratio significantly impact the flow structures and the vortex shedding modes. When G/D increases, the heat transfer efficiency shows a trend of first increasing and then decreasing due to the interaction between the heated plate and the vortices.

Key words: magnetohydrodynamics, vibrating heated plate, heat transfer, gap ratio, vortex shedding

CLC Number:

O361.3
TK124

ZHENG Bochen, BAO Xingyu, ZHANG Nianmei. Numerical study on heat transfer enhancement in the flow around a cylinder near a vibrating heated plate under a magnetic field[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2025.034.

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