Effective length of the capillary (\(L_{\rm{eff}}\)) divided by the electroosmotic hold-up time (\(t_{\rm{eo}}\)). \[\boldsymbol{v}_{\rm{eo}} = L_{\rm{eff}}/t_{\rm{eo}}\]
Note: In capillary electromigration, this velocity is positive, by convention, in the direction from the sample introduction end of the capillary to the detection end, otherwise negative.
See: electroosmosis
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 216 (https://doi.org/10.1515/pac-2017-0111)