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Journal of Enhanced Heat Transfer

Theory and Application in High Performance Heat and Mass Transfer 

ISSN for PRINT: 1065-5131

Institutional price:

$577.00

Issues per year:

4

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Best Paper Award Selection - Editorial Board Site

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2007, Volume14

Issue 3

  83 pages  

DOI: 10.1615/JEnhHeatTransf.v14.i3   

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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.

    DOI: 10.1615/JEnhHeatTransf.v14.i3.10

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