Natural convection in an inclined rectangular cavity with different thermal boundary conditions at the top plate

Journal Article · Sun May 01 00:00:00 EDT 1988 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250491· OSTI ID:5404198

Karayiannis, T G; Tarasuk, J D ^[1]

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1. Univ. of Western Ontario, London (Canada)

Natural convection inside a rectangular cavity with different temperature boundary conditions on the cold top plate was studied using a Mach-Zehnder interferometer for {theta} = 15, 45, and 60 deg to the horizontal. At {theta} = 60 deg coupling with external forced convection and non-coupled heat transfer from a cavity with an isothermal top plate was studied. In all experiments the bottom hot plate was isothermal. The Rayleigh number Ra was varied from subcritical to 6 {times} 10{sup 5} and the cavity aspect ratio AR{sub x}, from 6.68 to 33.4. The Reynolds number of the external forced flow Redn was constant and approximately equal to 5.8 {times} 10{sup 4}. It was found that for Ra {approx lt} 3 {times} 10{sup 4} the differing thermal boundary conditions at the top plate did not affect the local or average heat transfer rates from the cavity. For Ra {approx gt} 3 {times} 10{sup 4} coupling at the top plate compared to the non-coupled case resulted not only in a reduction in the variation of the local heat transfer rates at the cold plate, but also in a significant reduction in the variation of the average transfer rates from hot and cold plates on the cavity. Forced convection at the top plate as compared to natural convection resulted only in a small reduction in the heat transfer coefficient at the cold plate. Correlation equations for coupled and noncoupled average heat transfer rates are presented.

• OSTI ID: 5404198
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 110:2; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY CONDITIONS
CAVITIES
CONVECTION
ENERGY TRANSFER
FORCED CONVECTION
HEAT FLUX
HEAT TRANSFER
INTERFEROMETERS
MACH-ZEHNDER INTERFEROMETER
MASS TRANSFER
MEASURING INSTRUMENTS
MEASURING METHODS
NATURAL CONVECTION
ORIENTATION
REYNOLDS NUMBER