Abstract

Experiments were conducted to study the electro-osmotic (EO) flow rate as affected by various factors, including solution pH, electric field strength, soil water content, and electrolyte concentration. Results indicate that the EO flow rate is proportional to the electrokinetic charge density and the electric field strength. The presence of inert-electrolytes has no significant effect on the EO flow rate. A parabolic relationship between the EO flow rate and the water content was observed. Based on the finite plate model, the EO flow rate (Q), can be expressed as a function of electrokinetic charge density (σe), field strength (Eo/L), and soil water content (ω), i.e Q = Kσe(Eo/L)ω2. The characteristic coefficient, K, is a collection of several physical properties of the soil-water system including the fluid density (ρ), the specific surface area (Σ), width of the water layer (w), and the fluid viscosity (μ), i.e., K = kfw/μρ2Σ2. The K value was 57 cm3·μC-1·V-1.

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