Electroosmotic flow definition

The primary advantage of such an approach is that it creates a flat flow profile, and thus allows definition of precise flow rates and narrow residence time distributions. Nevertheless, electroosmotic flow (EOF) pumps are severely limited in their widespread application to molecular synthesis due to a need for a conductive solvent and the fact that varying electrophoretic mobilities of reagents and products leads to time-dependent concentration gradients within the reactor that can degrade performance. 

In the majority of microfluidic cases where 1/k is much smaller than the chaimel height the Helmholtz-Smoluchowski equation provides a reasonable estimate of the flow velocity at the edge of the double layer field. As such when modelling two and three dimensional flow systems it is common to apply this equation as a shp boundary condition on the bulk flow field. Since beyond the double layer by definition pe = 0, the flow equation reduces to (assuming pure electroosmotic flow) to a simple Lapla-... 

Electroosmotic flow over non-uniform surfaces Definition... 

The TCE distribution in the control column after 672 shows a decline in TCE concentration from the contaminated zone proximal to the anode (0 cm), vertically downwards in the soil column, and most likely represents the diffusion of TCE (Figure 4). The TCE concentration profiles in ECs define a broad distribution and indicate that the bulk of the TCE has moved towards the cathode in response to electroosmotic fluid flow. After one week of processing, the bulk of contaminant has moved more than 5 cm toward the cathode. After two weeks ofEO, the center of the plume has moved more than 10 cm toward the cathode. After three and four weeks of EO, there are no definite peaks within the column, however, the concentrations of TCE remained highest near the cathode (Figure 4). 

Now, following Ghowsi et al. (1990), we will briefly treat the migration velocity of the uncharged solute species i in terms of the electroosmotic mobility yig,p of the elec-troosmotic flow and the ionic mobility due to electrophoresis as in definition (6.3.10c), namely... 

---