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Journal of Porous Media

ISSN for PRINT: 1091-028X

Institutional price:	$713.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2007, Volume10

103 pages

Issue price - $99.00

Measurement of the Effective Thermal Conductivity of Powders Using a Three-Layer Structure

Fethi Albouchi
Ecole Nationale d'Ingénieurs de Monastir, Laboratoire d'Etudes des Systémes Thermiques et Energétiques, Avenue Ibn El Jazzar, 5019 Monastir, Tunisie

Foued Mzali
Ecole Nationale d'Ingénieurs de Monastir, Laboratoire d'Etudes des Systémes Thermiques et Energétiques, Avenue Ibn El Jazzar, 5019 Monastir, Tunisie

Sassi Ben Nasrallah
Laboratoire d'Études des Systèmes Thermiques et Énergétiques, École Nationale d'Ingénieurs de Monastir, Monastir 5019 Tunisia

ABSTRACT

This article deals with the experimental measurement of the effective thermal conductivity of powders using a photothermal method with a crenel heating excitation. This method represents an improvement of the technique presented in a preceding article. It consists of applying a heat flux on the front face of a three-layer structure and recording the temperature on the rear face using a Tellure of Bismuth thermocouple. The powder is poured into a Teflon cell which is closed by two thin copper layers. Measurements are reported on several powders with spherical particles. The parameter identification is performed by the minimization of the ordinary least squares objective function, comparing the measured temperatures to the response of a thermal model built by the thermal quadrupole formalism. The used iterative algorithm is based on the Gauss-Newton method.