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Heat Transfer in Dry Aggregated Soil: I. Heat Conduction¹

ABSTRACT

The thermal conductivities of aggregated soils were determined experimentally in the laboratory. As expected the thermal conductivity decreases as the size of the aggregates and the total and interaggregate porosities increase. Good agreement between the measured and predicted thermal conductivity values, by two methods, was found only for small aggregates, but failed increasingly as the aggregate size increased. The discrepencies between measured and predicted values are discussed and are attributed to thermal contact resistance between the soil aggregates that increases as the size and the numbers of the contact points for the aggregates decreases.

¹ Contribution from the Agri. Res. Organization, The Volcani Center, Israel, and the Dep. of Soil and Environ. Sci., Univ. of Calif., Riverside. This work was partially supported by Grant AID/ta-G-1141.

² Soil Scientist, Div. of Soil Physics, Inst. of Soil and Water Agric. Res. Organization, The Volcani Center, Bet Dagan, Israel, on sabbatical leave at the Dep. of Soil and Environ. Sci., Univ. of Calif., Riverside, CA 92521.

Received for publication April 27, 1977. Accepted for publication July 14, 1977.

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