Effective thermal conductivity of granular porous materials

Journal Article · Fri Mar 01 04:00:00 EST 1996 · International Communications in Heat and Mass Transfer

DOI:https://doi.org/10.1016/0735-1933(96)00003-6· OSTI ID:207747

Tavman, I H ^[1]

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1. Dokuz Eylul Univ., Izmir (Turkey). Mechanical Engineering Dept.

Various models and formulae have been proposed for the prediction of effective thermal conductivity for two-phase systems, all the models predict the effective thermal conductivity as function of thermal conductivity of each phase and volume content of each phase or porosity which is defined as the ratio of fluid volume to the total volume. Some of the models take further into consideration such parameters as the shape of the solid particles, the orientation and the distribution of the particles, the contact resistance between particles. In this study, various conduction models for two-phase materials are considered and the range of applicability of these models is discussed. Experimental work is carried out on construction sand of various grain size and different porosity in air at atmospheric pressure, and the results are compared with theoretical models. A modified hot-wire method is used in the measurement of effective thermal conductivities. Porous materials may be divided into two main groups: air-cell type and granular-solid type. In the present article only granular-solid type of porous materials, formed of elements of granular solids located in continuous immobile fluid medium (gas or liquid), are considered.

• OSTI ID: 207747
• Journal Information: International Communications in Heat and Mass Transfer, Journal Name: International Communications in Heat and Mass Transfer Journal Issue: 2 Vol. 23; ISSN 0735-1933; ISSN IHMTDL
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
MATHEMATICAL MODELS
POROUS MATERIALS
SAND
THERMAL CONDUCTION
THERMAL CONDUCTIVITY