Effect of wall conduction on combined free and forced laminar convection in horizontal rectangular channels

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3248206· OSTI ID:5476612

Hwang, G J ^[1]; Chou, F C ^[2]

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1. National Tsing Hau Univ., Hsinchu (Taiwan)
2. National Central Univ., Chungli (Taiwan)

This paper presents a numerical study of the effect of peripheral wall conduction on combined free and forced laminar convection in hydrodynamically and thermally fully developed flow in horizontal rectangular channels with uniform heat input axially. In addition to the Prandtl number, the Grashof number Gr{sup +}, and the aspect ratio {gamma}, a parameter K{sub p} indicating the significance of wall conduction plays on an important role in heat transfer. A finite-difference method utilizing a power-law scheme is employed to solve the system of governing partial differential equations coupled with the equation for wall conduction. The numerical solution covers the parameters: Pr = 7.2 and 0.73, {gamma} = 0.5, 1, and 2, K{sub p} = 10{sup {minus}4} {minus} 10{sup 4}, and Gr{sup +} = 0 {minus} 1.37 {times} 10{sup 5}. The flow patterns and isotherms, the wall temperature distribution, and friction factor, and the Nusselt number are presented. The results show a significant effect of the conduction parameter K{sub p}.

• OSTI ID: 5476612
• 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. 109:4; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CALCULATION METHODS
CONVECTION
DUCTS
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
FRICTION FACTOR
GRASHOF NUMBER
HEAT EXCHANGERS
HEAT TRANSFER
ITERATIVE METHODS
MASS TRANSFER
NUMERICAL SOLUTION
NUSSELT NUMBER
ORIENTATION
PHYSICAL PROPERTIES
PRANDTL NUMBER
TEMPERATURE DISTRIBUTION
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
WALLS