TECHNICAL PAPERS: Natural and Mixed Convection

Experimental Analysis of Thermal Instability in Natural Convection Between Horizontal Parallel Plates Uniformly Heated

[+] Author and Article Information
O. Manca, B. Morrone

Dipartimento di Ingegneria Aerospaziale, Seconda Università, degli studi di Napoli, Via Roma 29, 81031 Aversa CE, Italy

S. Nardini

Dipartimento di Energetica, DETEC Termofluidodinamica applicata e Condizionamenti ambientali, Università degli studi Federico II, Piazzale Tecchio, 80125 Napoli, Italy

J. Heat Transfer 122(1), 50-57 (Dec 10, 1999) (8 pages) doi:10.1115/1.521427 History: Received December 09, 1998; Revised December 10, 1999
Copyright © 2000 by ASME
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(a) View of the test section; (b) Sketch of heated sandwiched plate
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b=32.2 mm,qΩ=120 W/m2, and Gr=2.35×105, Mode III: (a) longitudinal section z=0.0 mm; cross-stream section at (b) x=20 mm; (c) x=60 mm; (d) x=100 mm; (e) x=160 mm
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Cross-stream section for b=32.2 mm,qΩ=240 W/m2, and Gr=4.65×105, Mode III: (a) x=20 mm; (b) x=60 mm; (c) x=100 mm
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Time records of the air temperature at selected x-coordinate and y=8 mm for b=32.2 mm and (a) qΩ=60 W/m2(Gr=1.24×105); (b) qΩ=120 W/m2(Gr=2.35×105)
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Time records of the air temperature at selected y-coordinate for b=32.2 mm and qΩ=120 W/m2(Gr=2.35×105) at (a) x=60 mm; (b) x=100 mm
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Time records of the air temperature at selected y-coordinate for b=40.0 mm and qΩ=120 W/m2(Gr=5.56×105) at (a) x=50 mm; (b) x=100 mm
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Time-average temperature along the y-direction at z=0.0 mm and several x-coordinates for Mode III: (a) b=32.2 mm and qΩ=60 W/m2(Gr=1.24×105); (b) b=32.2 mm and qΩ=120 W/m2(Gr=2.35×105); (c) b=40.0 mm and qΩ=120 W/m2(Gr=5.56×105); (d) b=40.0 mm,qΩ=240 W/m2(Gr=1.06×106)
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Sketch of the visualization and anemometric arrangement
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Relative heat fluxes distributions along the length of the plate: (——) convective and (−−−) conductive
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Cross-stream sections for b=32.2 mm,qΩ=60 W/m2, and Gr=1.24×105, Mode III at (a) x=20 mm; (b) x=60 mm; (c) x=100 mm; (d) x=150 mm
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Subdivision of the main flow in the longitudinal section
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Longitudinal section at z=0.0 mm for b=32.2 mm,qΩ=60 W/m2; (a) Mode I (Gr=2.42×105); (b) Mode II (Gr=1.22×105); (c) Mode III (Gr=1.24×105)




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