Water Evaporation Versus Condensation in a Hygroscopic Soil |
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Authors: | A L Lozano F Cherblanc J-C Bénet |
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Institution: | (1) Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA |
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Abstract: | The liquid/vapour phase change of water in soil is involved in many environmental geotechnical processes. In the case of hygroscopic
soils, the liquid water is strongly adsorbed on the solid phase and this particular thermodynamic state can highly influence
the phase change kinetics. Based on the linear Thermodynamic of Irreversible Processes ideas, the non-equilibrium phase change
rate is written as a linear function of the water chemical potential difference between the liquid and vapour state. In this
relation, the system is characterized by a phenomenological coefficient that depends on the state variables. Using an original
experimental set-up able to analyze the response of a porous medium subjected to non-equilibrium conditions, the phase change
coefficient is determined in various configurations. This paper focuses on the influence of the gas phase pressure and underlines
that a low gas pressure decreases the phase change kinetics. Then, evaporation and condensation processes are compared showing
an asymmetric behaviour. These experimental results are interpreted from a microscopic point of view by relying on recent
works dealing with molecular dynamics numerical simulation of the liquid/gas interface. |
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