American Society of Civil Engineers


Fully Coupled Analysis of Heat, Moisture, and Air Transfer in Unsaturated Soil


by Hywel Rhys Thomas, (Reader, Div. of Civ. Engrg., Univ. of Wales Coll. of Cardiff. P.O. Box 917, Cardiff CF2 1XH, Wales) and Michael Robert Sansom, (Res. Asst., Div. of Civ. Engrg., Univ. of Wales Coll. of Cardiff. P.O. Box 917, Cardiff CF2 1XH, Wales)

Journal of Engineering Mechanics, Vol. 121, No. 3, March 1995, pp. 392-405, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9399(1995)121:3(392))

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Document type: Journal Paper
Abstract: This paper presents a new theoretical formulation of coupled heat, moisture, and air transfer in unsaturated soil. A mechanistic approach is adopted that extends a previous potential-based formulation of coupled heat and moisture/air transfer and coupled heat/moisture transfer at constant pressure. Excellent correlation was achieved. Furthermore, verification of the complete new formulation has been achieved by satisfactory comparison of results with those obtained from an independent alternative numerical model. An application of the model to an example test problem is then presented, making use of thermophysical soil parameters that have been independently established for a range of the soil properties specified in the formulation. A number of features of interest related to the interaction between elevated temperatures, induced increased air pressure, and infiltration rates are described. The importance of including the air phase is thus identified, particularly in relation to its effect on the hydration process.


ASCE Subject Headings:
Air-water interactions
Analysis
Soil water
Temperature effects
Unsaturated soils
Water transfer