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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v8.i2.10
pages 97-114

Hot-Wire Method for Measuring Effective Thermal Conductivity of Porous Media

Latifa Sassi
Laboratoire d'Etude des Systemes Thermiques et Energetiques, Ecole Nationale d'Ingenieurs de Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia
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

ABSTRACT

The effective thermal conductivity λe in porous media is often measured by the transient hot-wire method. This technique uses an identification method based on the Blackwell solution that makes some valuable assumptions (heat transfers are one-dimensional and by conduction only, and the sample is considered as an infinite medium), which are the origin of vagueness. A two-dimensional and dynamic model of heat transfer describing the functioning of the hot-wire method is developed. The numerical solution of the equations allows the tracing of the time-space evolution of the state variables (temperature, pressure, velocity) inside the porous medium and the determination of the validity domain of the Blackwell identification method. The results show that the Blackwell technique is accurate (better than 1%) for building materials where the wire is thin compared to the sample (γ < 5 × 10−3 ), the aspect ratio of the sample is ≥1.5, and the Rayleigh number is ≤100.


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