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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v11.i4.110
pages 331-340

Field Coordination of Air Convection Heat Transfer in Rectangular Channel with Magnetic Field

Lijun Yang
MOE Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, 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
Yaozu Song
Department of Engineering Mechanics, Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Tsinghua University, Beijing 100084, P. R. China

ABSTRACT

The field coordination principle, as a kind of guiding rule for convection heat transfer enhancement, requires that the spanwise flows should be enhanced for the convection heat transfer of air in a rectangular channel. A magnetic quadrupole field acting on the air can drive its spanwise flow, and eight longitudinal vortices can consequently form. The velocity and temperature fields as well as the Nusselt numbers are all presented for fully developed flows at Reynolds numbers between 200 and 2000 by application of the magnetic quadrupole field. The field coordination number is used to evaluate the enhancement of convection heat transfer and shows that the longitudinal vortices can improve the coordination between the velocity and temperature fields, which results in the enhancement of heat transfer process.


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