Thermodynamic Correction for Salts in Variably Saturated Porous Media |
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Authors: | Erick R Burns Jean-Yves Parlange John S Selker Ronald B Guenther |
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Institution: | (1) Department of Geology and Geophysics, University of Calgary, 2500 University Drive, Northwest, Calgary, Alberta, T2N IN4, Canada |
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Abstract: | Using thermodynamic principles, the general relationship describing the equilibrium vapor content in the gas phase above a
saline liquid and across a curved liquid–gas interface is developed. Since high salt concentration affects the intensive and
extensive liquid properties, it is also necessary to account for these effects in liquid water content/liquid water pressure
relationship curves so that experimentally derived curves for pure water may be useful for elevated salt concentrations. The
appropriate thermodynamic relationships are derived to describe the salt effects on liquid and vapor properties. The resulting
equations are valid for salt concentrations between zero and saturation, and for any temperatures that nominally occur in
nearsurface geologic materials. |
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Keywords: | sodium chloride (NaCl) saline brine vapor depression thermodynamic correction constitutive relation unsaturated |
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