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A METHOD FOR DETERMINATION OF WATER CONTENT IN REAL AND MODEL POROUS MEDIA IN EQUILIBRIUM WITH BULK ICE OR GAS HYDRATE
Session: Laboratory Testing in Cold Regions / Essais en laboratoire en ingénierie nordique
Vladimir Istomin, Skolkovo institute of science and technology (Skoltech) (Russia)
Evgeny Chuvilin, Skolkovo institute of science and technology (Skoltech) (Russia)
Boris Bukhanov, Skolkovo institute of science and technology (Skoltech) (Russia)
Tsutomu Uchida, Faculty of Engineering, Hokkaido University (Japan)
A method for estimation of equilibrium water content in porous media in contact with bulk ice or gas hydrate is discussed. Measurements of water potential (and/or thermodynamic activity of water) were carried out on the Decagon company WP 4 device. Two types of porous media were used: the artificial samples with known sizes of pores (controlled pore glasses - CPG) and the polymineral clay. On the base of experimental determination of water potential in porous media the thermodynamic schemes are considered for: 1) unfrozen water estimation from the equilibrium “bulk ice - confined water in hydrophilic porous media” depending on temperature (for negative temperatures on Celsius); 2) nonclathrated water content from the equilibrium “bulk gas hydrate – confined water in hydrophilic porous media” depending on temperature and pressure of gas hydrate-former (methane, natural gas, etc.). The model is applied for estimations the unfrozen and nonclathrated water contents in the pore samples.
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