Buoyancy effects on forced convection heat transfer in the transition regime of a horizontal boundary layer heated from below

Journal Article · Mon Aug 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/10.1115/1.3250534· OSTI ID:5345997

Cheng, K C; Obata, T; Gilpin, R R ^[1]

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1. Univ. of Alberta, Edmonton (Canada)

Convective instability and buoyancy effects on forced convection heat transfer in horizontal boundary layers heated from below by a constant temperature plate are studied experimentally for flow regimes with Re{sub 2} = 2.5 {times} 10{sup 8} {approximately} 1.5 {times} 10{sup 12}. Heat transfer results obtained by heat flux gages and temperature measurements are studied using convective instability parameters, Gr{sub x}/Re{sub x}{sup 1.5} for laminar flow and Gr{sub x}/Re{sub x}{sup 2.7} for turbulent flow, with emphasis on flow in the transition regime. Buoyancy effects on heat transfer are also studied by comparison with predictions from the Pohlhausen solution and the von Karman analogy. Convective instability data, velocity and temperature profiles, and flow visualization photographs (obtained by the hydrogen bubble method) and the wall temperature field (obtained by liquid crystal visualization) are presented. Flow visualization photographs reveal the spanwise periodic vortical motion, and the fluctuating velocity and temperature fields near the wall.

• OSTI ID: 5345997
• 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. 110:3; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY LAYERS
BUBBLES
CONVECTION
CRYSTALS
ENERGY TRANSFER
FLOW VISUALIZATION
FLUID FLOW
FLUIDS
FORCED CONVECTION
HEAT FLUX
HEAT TRANSFER
LAMINAR FLOW
LAYERS
LIQUID CRYSTALS
LIQUIDS
MASS TRANSFER
ORIENTATION
PHYSICAL PROPERTIES
PLATES
TEMPERATURE DISTRIBUTION
TEMPERATURE MEASUREMENT
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TURBULENT FLOW
VELOCITY