Laminar mixed convection in a horizontal semicircular duct with axially nonuniform thermal boundary condition on the flat wall

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Numerical Heat Transfer. Part A, Applications; (United States)

DOI:https://doi.org/10.1080/10407789408955943· OSTI ID:7205145

Karki, K C; Sathyamurthy, P S ^[1]; Patankar, S V ^[2]

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1. Innovative Research, Inc., Minneapolis, MN (United States)
2. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Mechanical Engineering

Mixed convection in a horizontal semicircular duct is studied numerically. An axially nonuniform temperature distribution is prescribed on the flat wall, with the midsection at a higher temperature than the end sections. The full three-dimensional Navier-Stokes equations coupled with the energy equation are solved using a control-volume method. Results are presented for two values of the Grashof number (Gr = 5 [times] 10[sup 3] and 5 [times] 10[sup 4]) and three values of the Reynolds number (Re = 10, 20, 50), for a gas with Prandtl number of 0.7. For flow conditions characterized by a large value of the parameter Gr/R[sup 2], the buoyancy forces give rise to both longitudinal and transverse rolls in the duct, which cause nonuniformities in the heat flux distribution. The secondary flow pattern and the heat flux distribution on the heated section of the flat wall are strongly dependent on the thermal boundary condition on the curved wall of the duct.

• OSTI ID: 7205145
• Journal Information: Numerical Heat Transfer. Part A, Applications; (United States), Journal Name: Numerical Heat Transfer. Part A, Applications; (United States) Vol. 25:2; ISSN NHAAES; ISSN 1040-7782
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CONVECTION
DUCTS
ENERGY TRANSFER
FLUID FLOW
GAS FLOW
HEAT TRANSFER
LAMINAR FLOW
MASS TRANSFER
VORTEX FLOW