The coupled phenomena of radiative–magnetohyrodynamic (MHD) natural convection in a horizontal cylindrical annulus are numerically investigated. The buoyant flow is driven by the temperature difference between the inner and outer cylinder walls, while a circumferential magnetic field induced by a constant electric current is imposed. The hybrid approach of finite volume and discrete ordinates methods (FV-DOM) is developed to solve the nonlinear integro-differential governing equations in polar coordinate system, and accordingly, the influences of Hartmann number, radiation–convection parameter, and optical properties of fluid and wall on thermal and hydrodynamic behaviors of the “downward flow,” originally occurring without consideration of radiation and magnetic field, are mainly discussed. The results indicate that both the circulating flow and heat transfer are weakened by the magnetic field, but its suppression effect on the latter is rather small. Under the influence of magnetic field, the “downward flow” pattern has not been obtained from zero initial condition even for the case of weak radiation of NR = 0.1. Besides, the variation of radiative heat transfer rate with angular positions diminishes for the fluid with strong scattering or weak absorption.
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Research-Article
Influence of Optical Parameters on Magnetohydrodynamic Natural Convection in a Horizontal Cylindrical Annulus
Wei Wang,
Wei Wang
School of Energy Science and Engineering,
Central South University,
Changsha 410083, China
e-mail: wangwei_neu_china@hotmail.com
Central South University,
Changsha 410083, China
e-mail: wangwei_neu_china@hotmail.com
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Ben-Wen Li,
Ben-Wen Li
School of Energy and Power Engineering,
Institute of Thermal Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mails: heatli@dlut.edu.cn; heatli@hotmail.com
Institute of Thermal Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mails: heatli@dlut.edu.cn; heatli@hotmail.com
1Corresponding author.
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Zhang-Mao Hu
Zhang-Mao Hu
School of Energy and Power Engineering,
Changsha University of Science and
Technology,
Changsha 410076, China
e-mail: huzhangmao@163.com
Changsha University of Science and
Technology,
Changsha 410076, China
e-mail: huzhangmao@163.com
Search for other works by this author on:
Wei Wang
School of Energy Science and Engineering,
Central South University,
Changsha 410083, China
e-mail: wangwei_neu_china@hotmail.com
Central South University,
Changsha 410083, China
e-mail: wangwei_neu_china@hotmail.com
Ben-Wen Li
School of Energy and Power Engineering,
Institute of Thermal Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mails: heatli@dlut.edu.cn; heatli@hotmail.com
Institute of Thermal Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mails: heatli@dlut.edu.cn; heatli@hotmail.com
Zhang-Mao Hu
School of Energy and Power Engineering,
Changsha University of Science and
Technology,
Changsha 410076, China
e-mail: huzhangmao@163.com
Changsha University of Science and
Technology,
Changsha 410076, China
e-mail: huzhangmao@163.com
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 27, 2018; final manuscript received January 9, 2019; published online April 17, 2019. Assoc. Editor: Antonio Barletta.
J. Heat Transfer. Jun 2019, 141(6): 062502 (12 pages)
Published Online: April 17, 2019
Article history
Received:
May 27, 2018
Revised:
January 9, 2019
Citation
Wang, W., Li, B., and Hu, Z. (April 17, 2019). "Influence of Optical Parameters on Magnetohydrodynamic Natural Convection in a Horizontal Cylindrical Annulus." ASME. J. Heat Transfer. June 2019; 141(6): 062502. https://doi.org/10.1115/1.4042811
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