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CFD testing of the pointwise use of the Zehner–Schlünder formulas for fixed-bed stagnant thermal conductivity
- Source :
-
International Communications in Heat & Mass Transfer . Mar2013, Vol. 42, p1-4. 4p. - Publication Year :
- 2013
-
Abstract
- Abstract: For the conduction mode of heat transfer in a fixed bed, we have carried out an evaluation of whether the most widely-used equations for the overall stagnant bed effective thermal conductivity ke 0, the Zehner–Schlünder cell model, can be used on a pointwise basis to obtain local values of ke 0(r) using the local bed voidage, ε(r). A three-dimensional computational fluid dynamics (CFD) model of an annular test bed of spheres with tube-to-particle diameter ratio equal to four was constructed to obtain the local void fraction, and solved for the radial temperature profiles. Comparisons to a one-dimensional pseudo-continuum model with ke 0(r) gave good agreement for a range of values of solid thermal conductivity, establishing that the Zehner–Schlünder cell model can be used in local models of fixed-bed heat transfer. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 07351933
- Volume :
- 42
- Database :
- Academic Search Index
- Journal :
- International Communications in Heat & Mass Transfer
- Publication Type :
- Academic Journal
- Accession number :
- 85853737
- Full Text :
- https://doi.org/10.1016/j.icheatmasstransfer.2012.12.013