Non-Darcian convection in cylindrical packed beds

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

DOI:https://doi.org/10.1115/1.3250495· OSTI ID:5474639

Hunt, M L; Tien, C L ^[1]

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1. Univ. of California, Berkeley (USA)

Non-Darcian transport describes the nonuniform flow and thermal anomaliesoften found in flow through packed beds. These effects include the high-flow-rate inertial pressure loss, near-wall porosity variation, solid-boundary shear, and thermal dispersion. Inclusion of these effects significantly alters the velocity and temperature profiles from those predicted by models using uniform or Darcian flow. In this paper, the non-Darcian formulation is used to predict the heat transfer rates for cylindrical packed beds such as chemical reactors. Traditional analyses of chemical reactors assume slug flow and must include a temperature-slip boundary condition to predict the measured temperature profiles. The present analysis predicts similar temperature variations by allowing the velocity and diffusivity to vary across the bed. The results agree with experimental relations needed in conventional reactor models.

• OSTI ID: 5474639
• 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

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CHEMICAL REACTORS
CONVECTION
CYLINDERS
ENERGY TRANSFER
HEAT FLUX
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
MOMENTUM TRANSFER
PACKED BED
VELOCITY