Geoscience Reference
In-Depth Information
Figure 7.3
Principles of electroosmosis (
after
Das, 2008).
Figure 7.4
Helmholtz-Smoluchowski theory for electroosmosis (
after
Das, 2008).
radii are relatively large in comparison with the thickness of the diffuse double layer
and the mobile ions are concentrated near the soil-water interface (Figure 7.4). Based
on Hemholtz-Smoluchowski, the zeta potential (
ζ
) and the charge distribution in the
fluid adjacent to the soil surface play important roles in determining the electroosmotic
flow (see Chapter 3).
The rate of electroosmotic flow is controlled by the coefficient of electroosmotic
permeability of the soil,
k
e
, which is a measure of the fluid flux per unit area of the
soil per unit electric gradient. The value of
k
e
is a function of
ζ
, the viscosity of the
