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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

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

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v12.i6.70
pages 573-583

Optimal Experiment Design and Measurement of the Effective Thermal Conductivity of a Porous Medium in the Presence of Free Convection

Sami Znaidia
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationaled'Ingénieurs de Monastir, Avenue Ibn El Jazzar, Monastir 5019, Tunisia
Fethi Albouchi
ISIMM
Foued Mzali
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationaled'Ingénieurs de Monastir, Tunisia
Abdelmajid Jemnia
Laboratoire d'Etude des Systemes Thermiques et Energetiques, Ecole Nationale d'Ingenieurs de Monastir, Tunisia
Sassi Ben Nasrallah
Laboratoire d'Études des Systèmes Thermiques et Énergétiques, Ecole Nationale d'Ingénieurs de Monastir, Monastir 5019 Tunisie

ABSTRAKT

This paper deals with the optimal experiment design and the measurement of the effective thermal properties of a porous medium using the transient hot-wire technique. The differential equations governing the combined conduction and free convection heat transfer in a gray porous medium are solved numerically using the finite volume method. The experiment design is performed using different optimality criteria and the measurements are reported on a sand sample constituted of spherical particles. The parameter estimation is performed by the minimization of the ordinary least-squares objective function comparing the measured temperatures to the response of a thermal model depending on the unknown thermophysical parameters. The used iterative algorithm is based on the Levenberg-Marquardt method.


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