Abstract
Water adsorption effect on a solid surface can change water fluidity and viscosity to leave an impact on engineering processes. However, the water adsorption effect caused by Coulomb interaction (Coulomb adsorption) has seldom been tested. Therefore, this paper designed a narrow slot seepage experiment to study the water adsorption effect on water fluidity under different external electric field along with different ion concentration and hydraulic gradient. The experiment results showed that the dynamic viscosity of water in the slot would be enhanced by the growing electric field strength; the growth of hydraulic gradient was not conductive to Coulomb adsorption; and there was a threshold hydraulic gradient iT (around 26.67 in this paper) that when i > iT, the growth of ion concentration would be conductive to Coulomb adsorption, while it would be adverse to Coulomb adsorption when i < iT.
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