Tempeature changes in soil as wetting front advances during infiltration
2003
Abu-Hamdeh, N.H., Postal Code 21110, P.O Box 422, Irbid (Jordan))
The study was conducted to observe temperature rise in soils due to heat of wetting that takes place as water infiltrates through a dry soil. Oven-dried clay loam soil was packed III double cylinder acrylic Columns at densities of 1.13 and 1.28 Mg m-3. Temperature fluctuations were monitored using four thermocouples inserted at equi-distant intervals along the soil column. A constant head of water was provided for infiltration through the soil column. Temperature rise in a soil during infiltration was most rapid near the surface and became much slower with increasing depth. The temperature profile was divided into three distinct zones A, Band C. The duration of zones A and C tended to increase with increasing depth in the soil while zone B had no significant change with depth. There was a spatial lag between the development of maximum temperature and the arrival of the liquid wetting front at the thermocouples. This spatial lag was less than 1 cm for the thermocouple near the surface and increased with increasing depth. Heat of wetting for the soil column was calculated by measuring the amount of heat stored behind the liquid wetting front at different sections of the temperature profile curves of the thermocouples. A heat of wetting of 867.68 kJ was obtained for the soil column.
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