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ISSN: 1065-5131 Print
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DOI: 10.1615/JEnhHeatTransf.v10.i1
Pages: 124
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DOI: 10.1615/JEnhHeatTransf.v10.i1.50
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Article price - $35.00 |
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Enhancement of Heat Transfer and Air Flow Rates in a Pipe with Application of a Magnetic Field
Shu-Shen Lu
Institute of Advanced Material Study, Kyushu University, Kasuga Koen 6-1, Kasuga 816-8580, Japan; Current address: School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, China
Hiroyuki Ozoe
Institute of Advanced Material Study, Kyushu University, Kasuga, Japan; and Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
Toshio Tagawa
Institute of Advanced Material Study, Kyushu University, Kasuga Koen 6-1, Kasuga 816-8580, Japan
Chang-Ho Lee
1 Institute of Advanced Material Study, Kyushu University, Kasuga Koen 6-1, Kasuga 816-8580, Japan; Сurrent address: LG Cable Ltd, Anyang-si, Kyungki-do 431-080, South Korea
Ben Hua
The Key Laboratory of Enhanced Heat Transfer and Energy Conservation, South China University of Technology, Guangzhou, China
ABSTRACT
The enhancement of flow and heat transfer rates of air flow in a pipe was studied when a gradient magnetic field was applied at a point of step heating in the wall. Numerical computations were successfully carried out for initial Reynolds number, Re0 = 50, 100, and 200; for pipe lengths L = 10, 20, and 30; and values of x = 105 - 2 ґ 106, which represents the strength of the magnetic field and the temperature difference between that of a pipe wall and that of inlet air. Application of a gradient magnetic field induced strong radial velocity components that decreased the thickness of the velocity and thermal boundary layers and increased both volume flow rate and the local Nusselt number to more than twice the value of the Graetz solution for the present parameters of computation.
pages 45-60
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