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Simultaneous Flow of Water and Heat under Periodic Heat Fluctuations¹

ABSTRACT

Theoretical Predictions of thermally induced moisture transfer have been compared ot measured quantities. Soil samples at different initial moisture contents were subjected to sinusoidal heat waves having an amplitude of 6C, and various periods of time. Temperatures were measured at various distances from the heat source, using copper-constantan thermocouples and recording the emf output.

The mositure distribution after the 1st, 2nd, 6th, and 16th cycle was determined gravimetrically.

The measured net transfer quantities were found to be larger than the theoretically predicted values by factors ranging from 0.8 to 8.0. The discrepancy between predicted and measured values of ent transfer may be attributed to the incompleteness of the theoretical models.

¹ Contribution from Utah State University,Logan, utah, Utah Agr. Exp. Sta. Journal Article no. 692. Work was supported by NSF grant no. 541.

² soil Physicist, The volcani Inst. for Agr. Res., Div. of Soil Tech., Rehovot, Israel. At present with the Dep. of Soils & Meteorology, Utah State Univ., Logan.

Received for publication October 20, 1967. Accepted for publication February 23, 1968.