1999 journal article

Local thermal nonequilibrium effects in forced convection in a porous medium channel: a conjugate problem

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 42(17), 3245–3252.

By: D. Nield* & A. Kuznetsov

co-author countries: New Zealand 🇳🇿 United States of America 🇺🇸
Source: Web Of Science
Added: August 6, 2018

Forced convection in a plane channel filled with a saturated porous medium, coupled with conduction in plane slabs bounding the channel, is investigated analytically on the basis of a two-temperature model allowing for local thermal nonequilibrium (LTNE). It is found that the effect of the finite thermal resistance due to the slabs is to reduce both the heat transfer to the porous medium and the degree of LTNE. An increase in value of the Péclet number leads to a decrease in the rate of exponential decay in the downstream direction but does not affect the value of a suitably defined Nusselt number. The dependence of the Nusselt number on a new solid–fluid heat exchange parameter, the solid/fluid thermal conductivity ratio, and the porosity, is investigated. The general two-temperature formulation of the thermal boundary conditions is discussed.