On the Validity of the “Thin” and “Thick” Double-Layer Assumptions When Calculating Streaming Currents in Porous Media
Figure 4
Typical results showing streaming current calculated using (i) the Poisson-Boltzmann equation (Is), (ii) assuming a thin double layer (), and (iii) assuming a thick double layer , as a function of dimensionless capillary radius (rd). The reported streaming currents have been scaled to the value of at rd = 1000. Note that there is a value of rd for which = . At this value of rd, the dimensionless streaming current is undefined (20).
