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Journal of Porous Media
IF: 1.752 5-Year IF: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Print: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v18.i2.40
pages 125-136

LOCAL THERMAL NON-EQUILIBRIUM AND HETEROGENEITY EFFECTS ON THE ONSET OF CONVECTION IN A LAYERED POROUS MEDIUM WITH VERTICAL THROUGHFLOW

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

ABSTRACT

We investigated the combined effects of throughflow and local thermal non-equilibrium on the onset of convection in a porous medium consisting of two horizontal layers. In our analytical study, which is performed using linear stability theory, we considered variations of permeability, fluid thermal conductivity, solid thermal conductivity, interphase heat transfer coefficient, and porosity. It is found that heterogeneity of permeability and fluid thermal conductivity have a major effect, heterogeneity of the interphase heat transfer coefficient and porosity have a lesser effect, while heterogeneity of solid thermal conductivity is relatively unimportant.


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