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多孔介质期刊
影响因子: 1.061 5年影响因子: 1.151 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v6.i1.30
7 pages

Effects of Gross Heterogeneity and Anisotropy in Forced Convection in a Porous Medium: Layered Medium Analysis

Andrey V Kuznetsov
Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC 27695-7910, USA
D A Nield
University of Auckland Auckland, New Zealand

ABSTRACT

The effects of gross heterogeneity and anisotropy, associated with horizontal fissures in a porous medium filling a parallel-plate channel, on forced convection are studied. An approximate analysis, based on a piecewise-constant (layered) distribution of permeability across the channel, is used to model the experiments performed by Paek et al. (1999) on foam material with drilled-out tubes. The analysis leads to estimates of the Nusselt number, Nu. Drilling out the tubes leads to a reduction in the value of Nu but an even greater reduction in the friction factor, f, so that the net result is an increase in the value of Nu/f, i.e., for a given driving pressure gradient the heat transfer is increased.


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