Abstract
This paper considers a particular heat and water vapor transfer problem in a nonisothermal steady state system. The results are applicable to a condition that may develop during the normal drying of porous materials. The rate equations are based on the theory of irreversible thermodynamics and the validity of Onsager's reciprocity relation is demonstrated with a macroscopic analysis of this particular model. The results of an experiment are presented which show the effects of temperature, pressure, and salt concentration on the evaporation and heat transfer from a porous plate. These data combined with the thermodynamic flux equations provide a means of calculating the effective concentration of dissolved salts at the air-water interface and the approximate depth of this increased concentration. The analysis also provides a method for determining the rate-limiting process in the experiment.
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