The interaction effects of surface radiation with turbulent natural convection of a transparent medium in rectangular enclosures have been numerically analyzed, covering a wide range of Rayleigh number from to and aspect ratio from 1 to 200. The vertical walls of the enclosure are isothermal and maintained at different temperatures. The adiabatic top and bottom walls of the enclosure have been modelled for the limiting cases of negligible or perfect conduction along their lengths. The interaction with surface radiation results in larger velocity magnitudes and turbulence levels in the vertical as well as horizontal boundary layers, leading to an increase in the convective heat transfer by ∼25 percent. Due to the asymmetrical coupling of radiation, the augmentation of convective Nusselt number of the cold wall is larger than that of the hot wall. In tall enclosures, the convective Nusselt number exhibits three distinct regimes with respect to aspect ratio, viz. the slow growth regime, the accelerated growth regime and the invariant (or saturated) regime. The augmentation of convective Nusselt number for perfectly conducting horizontal walls is found to be of similar nature to that in the case with radiation interaction.
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Interaction Effects Between Surface Radiation and Turbulent Natural Convection in Square and Rectangular Enclosures
K. Velusamy, Scientific Officer,,
K. Velusamy, Scientific Officer,
Thermal Hydraulics Section, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, India
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T. Sundararajan, Professor,,
T. Sundararajan, Professor,
Department of Mechanical Engineering, Indian Institute of Technology, Madras-600 036, India
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K. N. Seetharamu, Professor,
K. N. Seetharamu, Professor,
School of Mechanical Engineering, Universiti Sains Malaysia, (KCP) 31750 Tronoh, Malaysia
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K. Velusamy, Scientific Officer,
Thermal Hydraulics Section, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, India
T. Sundararajan, Professor,
Department of Mechanical Engineering, Indian Institute of Technology, Madras-600 036, India
K. N. Seetharamu, Professor,
School of Mechanical Engineering, Universiti Sains Malaysia, (KCP) 31750 Tronoh, Malaysia
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division May 10, 2000; revision received April 10, 2001. Associate Editor: R. D. Skocypec.
J. Heat Transfer. Dec 2001, 123(6): 1062-1070 (9 pages)
Published Online: April 10, 2001
Article history
Received:
May 10, 2000
Revised:
April 10, 2001
Citation
Velusamy, K., Sundararajan, T., and Seetharamu, K. N. (April 10, 2001). "Interaction Effects Between Surface Radiation and Turbulent Natural Convection in Square and Rectangular Enclosures ." ASME. J. Heat Transfer. December 2001; 123(6): 1062–1070. https://doi.org/10.1115/1.1409259
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