Forced convection in the entrance region of a packed channel with asymmetric heating

Journal Article · Tue Nov 01 04:00:00 EST 1988 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250597· OSTI ID:5345368

Cheng, P; Chowdhury, A ^[1]; Hsu, C T ^[2]

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1. Univ. of Hawaii, Honolulu (USA)
2. TRW Systems and Energy, Redondo Beach, CA (USA)

The problem of a thermally developing forced convective flow in a packed channel heated asymmetrically is analyzed in this paper. The flow in the packed channel is assumed to be hydrodynamically fully developed and is governed by the Brinkman-Darcy-Ergun equation with variable porosity taken into consideration. A closed-form solution based on the method of matched asymptotic expansions is obtained for the axial velocity distribution, and the wall effect on pressure drop is illustrated. The energy equation for the thermally developing flow, with transverse thermal dispersion and variable stagnant thermal conductivity taken into consideration, was solved numerically. To match the predicted temperature distribution with existing experimental data, it is found that a wall function must be introduced to model the transverse thermal dispersion process in order to account for the wall effect on the lateral mixing of fluid. The variations of the local Nusselt number along the streamwise direction in terms of the appropriate parameters are illustrated. The thermal entrance length effect on forced convection in a packed channel is discussed.

• OSTI ID: 5345368
• 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. 110:4A; 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
FORCED CONVECTION
HEAT TRANSFER
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
NUSSELT NUMBER
PHYSICAL PROPERTIES
POROUS MATERIALS
PRESSURE DROP
TEMPERATURE DISTRIBUTION
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
VELOCITY
WALL EFFECTS