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Journal of Porous Media

Impact factor: 1.035

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

Volumes:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.v12.i10.20
pages 939-954

Highly Porous Metal Foams: Effective Thermal Conductivity Measurement Using a Photothermal Technique

Mourad Fetoui
Ecole Nationale d'Ingénieurs de Monastir, Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Avenue Ibn Eljazzar, 5019 Monastir, Tunisie
Fethi Albouchi
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationaled 'Ingénieurs de Monastir, Tunisia
Fabrice Rigollet
Aix Marseille Univ, CNRS, IUSTI
Sassi Ben Nasrallah
Energy and Thermal Systems Laboratory, National Engineering School of Monastir, University of Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia

ABSTRACT

The effective thermal conductivity of highly porous metal foams is measured using a photothermal method with a crenel heating excitation. This method is based on a nondestructive technique. The foam is sandwiched between two thin aluminum plates. The front face of the three-layered structure is submitted to a heat flux and the temperature rise on the rear face is recorded using an infrared camera. Measurements are reported on several foams. 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 function of thermophysical parameters, built with thermal quadruple formalism. The used iterative algorithm is based on the Gauss-Newton method. The obtained results are compared to the literature values and a good agreement is noted.