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ISSN: 1065-5131 Print
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DOI: 10.1615/JEnhHeatTransf.v14.i3
Pages: 83
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DOI: 10.1615/JEnhHeatTransf.v14.i3.10
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Article price - $35.00 |
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Active Enhancement of Convection Heat Transfer of Air in a Rectangular Channel by Magnetically Induced Longitudinal Vortices
Li-Jun Yang
School of Energy and Power Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
Jian-Xun Ren
School of Aerospace, Department of Engineering Mechanics, Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Tsinghua University, Beijing 100084, P. R. China
Xiao-Ze Du
School of Energy and Power Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
Yong-Ping Yang
School of Energy and Power Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
Deng-Ying Liu
Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206; and Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China
ABSTRACT
The gradient magnetic field introduced to convection heat transfer in a channel can result in longitudinal vortices in fluid flows. The laminar flow and heat transfer characteristics of air in a rectangular channel confined to magnetic bi-pole and quadrupole fields were numerically investigated. The velocity and temperature fields were obtained and the friction coefficients and Nusselt numbers were compared at different Reynolds numbers and wall temperatures for both hydraulically and thermally developing and fully developed flows. Different longitudinal vortices were presented for convection heat transfer in the magnetic bi-pole and quadrupole fields. The vortex-induced heat transfer enhancement was discussed by using the field synergy principle. The results show that the synergy between the flow and temperature fields can be improved by the magnetically induced longitudinal vortices. For hydraulically and thermally developing flows, the synergy between the flow and temperature fields in the magnetic quadrupole field was superior to that in the bi-pole field. For hydraulically and thermally fully developed flows, however, the synergy in the magnetic quadrupole field was worse than that in the bi-pole field.
pages 189-198
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