Combined conduction and correlated-radiation heat transfer in packed beds
- Oita Univ. (Japan)
A quasi-homogeneous model for heat transfer in a plane-parallel packed bed of opaque spheres is presented. The proposed model takes into account the variable porosity distribution within a packed bed and the correlated radiative properties of packed spheres having gray diffuse surfaces. On the basis of the proposed model, combined conductive and radiative heat transfer through comparatively thin packed layers of cordierite spheres or oxidized steel spheres are analyzed numerically and the obtained results are compared with the experimental ones. Additionally, the adequacy of a simplified analytical formula for the total effective thermal conductivities of a packed bed is discussed. It is found that the detailed theoretical model accurately predicts the heat transfer characteristics and the temperature profiles of the plane-parallel packed beds, and the predictions derived from the approximate formula well-correlate with the present experimental data for the total effective thermal conductivities. 22 refs.
- OSTI ID:
- 6249425
- Journal Information:
- Journal of Thermophysics and Heat Transfer; (United States), Vol. 7:3; ISSN 0887-8722
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT TRANSFER
MATHEMATICAL MODELS
PACKED BEDS
BOUNDARY CONDITIONS
HEAT FLUX
POROSITY
SPHERES
TEMPERATURE DISTRIBUTION
TEMPERATURE RANGE 0400-1000 K
THERMAL CONDUCTIVITY
ENERGY TRANSFER
PHYSICAL PROPERTIES
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
420400* - Engineering- Heat Transfer & Fluid Flow