TECHNICAL PAPERS: Radiative Heat Transfer

Interaction Effects Between Surface Radiation and Turbulent Natural Convection in Square and Rectangular Enclosures

[+] Author and Article Information
K. Velusamy

Thermal Hydraulics Section, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102, India

T. Sundararajan

Department of Mechanical Engineering, Indian Institute of Technology, Madras-600 036, India

K. N. Seetharamu

School of Mechanical Engineering, Universiti Sains Malaysia, (KCP) 31750 Tronoh, Malaysia

J. Heat Transfer 123(6), 1062-1070 (Apr 10, 2001) (9 pages) doi:10.1115/1.1409259 History: Received May 10, 2000; Revised April 10, 2001
Copyright © 2001 by ASME
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Grahic Jump Location
Schematic of the enclosure and heat balance for an elemental wall segment
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Comparison of present solutions with reference solution and experimental data for Ra=5.32×1010,Raw=4.26×108, and AR=5; (a) Nusselt number, and (b) mid-height vertical velocity.
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Predicted fluid temperature variation at mid-width in an enclosure of AR=6 for Ra=7.12×1010: comparison with experimental data and reference solution.
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Effect of grid size on hot wall Nusselt number in square and tall enclosures for ΔT=50 K,To=323 K, and ε=0.9
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(a) Velocity field in a square enclosure during pure natural convection (in m/s), (Ra=1011, ε=0); (b) velocity field in a square enclosure during natural convection–radiation interaction (in m/s), (Ra=1011, ε=0.9, To=323 K,ΔT=50 K).
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(a) Temperature field in a square enclosure during pure natural convection, [(T−Tc)/ΔT],(Ra=1011, ε=0); (b) temperature field in a square enclosure during natural convection—radiation interaction, [(T−Tc)/ΔT];(Ra=1011, ε=0.9, To=323 K,ΔT=50 K).
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Influence of radiation on Nusselt numbers and fluid temperature; (a) hot wall Nusselt numbers; (b) cold wall Nusselt numbers, and (c) top and bottom wall Nusselt numbers and mid-width fluid temperature for Ra=1011,AR=1,To=323 K, and ΔT=50 K:Nur—radiative Nusselt number without flow; Nuf—convective Nusselt number without radiation, Nuhr,Nucr,Nutr, and, Nubr—radiative Nusselt numbers with coupling; Nuhf and Nucf—convective Nusselt numbers with coupling.
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Variation of convective, radiative and total Nusselt numbers with Rayleigh number for AR=1,To=323 K,ε=0.9, and ΔT=50 K
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Influence of top and bottom wall conduction on hot wall Nusselt number for Ra=1011,AR=1,To=323 K, and ΔT=50 K
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Comparison of present results with published results for Raw=5.4×105,AR=100,ε=0,To=323 K, and ΔT=50 K
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Variation of Nusselt numbers in tall vertical enclosures for Raw=1010,ε=0.9,To=323 K, and ΔT=50 K




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