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TECHNICAL PAPERS: Natural and Mixed Convection

Visualization and Prediction of Natural Convection of Water Near Its Density Maximum in a Tall Rectangular Enclosure at High Rayleigh Numbers

[+] Author and Article Information
C. J. Ho, F. J. Tu

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, ROC

J. Heat Transfer 123(1), 84-95 (Jul 20, 2000) (12 pages) doi:10.1115/1.1336511 History: Received December 09, 1999; Revised July 20, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of the physical configuration and coordinate systems  
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Photographs of the transient evolution of the flow structre (upper) and temperature field (lower) at (a) Fo=0.023 (t=2 min and 30 sec), (b) Fo=0.054(t=6 min), (c) Fo=0.077 (t=8 min and 30 sec), and (d) Fo=0.127(t=14 min) for θm=0.5,RaW=3.454×105
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Two-dimensional prediction of transient streamlines (upper) and isotherms (lower) in the cold-water-filled enclosure for θm=0.5,RaW=3.454×105
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Three-dimensional prediction of transient cross-sectional (x-y midplane) flow (upper) and temperature (lower) fields in the cold-water-filled enclosure for θm=0.5,RaW=3.454×105 with Az=2
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Photographs of the flow structure (upper) and temperature field (lower) of the oscillatory convection in the cold-water-filled enclosure at θm=0.5,RaW=3.454×105
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Predicted cyclic flow (upper) and temperature (lower) fields of the oscillatory convection in the cold-water-filled enclosure by the two-dimensional numerical simulation at θm=0.5,RaW=3.454×105
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Steady state cross-sectional (x-y midplane) (a) flow and (b) temperature fields predicted by the three-dimensional numerical simulation at θm=0.5,RaW=3.454×105 with Az=2
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Comparison of the steady state flow patterns (upper) and temperature fields (lower) among (a) visualization experiment, (b) three-dimensional (Az=2), and (c) two-dimensional simulations at θm=0.5,RaW=5.957×105
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Comparison of the steady state flow patterns (upper) and temperature fields (lower) among (a) visualization experiment, (b) three-dimensional (Az=2), and (c) two-dimensional simulations at θm=0.4,RaW=2.522×105
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Periodic variations of the flow structure (upper) and temperature field (lower) predicted by two-dimensional simulation at θm=0.4,RaW=5.437×105

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