Metal Porous Media Research Articles

Evaluation of the effective thermal conductivity in metallic porous media submitted to incident radiative flux in transient conditions

This paper describes the analytic model and the experimental system we have used to evaluate the effective thermal conductivity for different porous matrices where coupled conductive and radiative heat transfer take place originating from an incident radiative flux. The results we have obtained for metallic porous matrices made of duralumin turnings or copper wool show good agreement with the results one can find in the literature.

NUMERICAL SIMULATION OF FORCED CONVECTION HEAT TRANSFER IN POROUS PLATE CHANNELS USING THERMAL EQUILIBRIUM AND NONTHERMAL EQUILIBRIUM MODELS

A numerical study of fluid flow and convection heat transfer in a plate channel filled with metallic or nonmetallic particles using both the local thermal equilibrium model and a nonlocal thermal equilibrium model is presented in this paper. The numerical simulation results are compared with our experimental data, and a new modified thermal dispersion conductivity model is presented. The effects of the assumption of local thermal equilibrium versus nonlocal thermal equilibrium and the thermal dispersion effect on the convection heat transfer are investigated. The nonlocal thermal equilibrium model is appropriate for either nonmetallic or metallic porous media. The velocity distribution and the temperature fields are presented.

Non-isothermal liquid flow and heat transfer in sintered metallic porous media

Abstract This paper presents an experimental and analytical study of non-isothermal liquid flow in sintered fiber metallic porous media. The purpose of the paper is to present a self-consistent procedure for determining heat-transfer characteristics of porous metals. The analysis uses the volume averaged conservation equations. Darcy's law is assumed to hold and local thermal equilibrium is assumed to exist between the solid and liquid phases. The coupled conservation equations are solved for one and two dimensional temperature distributions using finite difference schemes. Different flow and thermal boundary conditions are used. The experiments involve the measurement of temperature distributions and effective thermal conductivities of water saturated copper and nickel sintered fiber metal wicks. The effective thermal conductivities are measured using the steady-state method of comparison and the resulting values are used in the volume averaged energy equation. The measured temperature distributions and those predicted by the analysis show good agreement. Thus the procedure presented in this paper for predicting heat transfer seems to be valid.