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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 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.v7.i2.60
11 pages

Heat and Mass Dispersion in Flows through Porous Media

Affonso Silva Telles
Curso de Pos-Graduagao em Tecnologia de Processos Quimicos e Bioquimicos (TPQB), Departamento de Engenharia Quimica, Escola de Quimica, Centre de Tecnologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
Jose Teixeira Freire
Departmento Engenharia Quimica, Universidade Federal de Sao Carlos, Sao Carlos, Brazil

ABSTRACT

The description of transport phenomena associated with flows of fluids in porous media requires the use of phenomenological coefficients with a complicated dependence on the fluid velocity. Directional dependence of conductivities is present even if the porous media structure is isotropic. The fluid velocity field provides a director with respect to which the orientation of all thermodynamic forces is compared. Transport in the transverse direction differs from transport in the velocity direction. Furthermore, linear dependence on the thermodynamic forces is insufficient once it has been experimentally observed that transport is faster in the flow direction than in opposition. Experimental data supporting this statement exist for the special case where fluid and porous media are at local thermal equilibrium at a single temperature.


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