Measurements of the fluid and particle mobilities in strong electric fields

Anil Kumar, Ezinwa Elele, Mike Yeksel, Boris Khusid, Zhiyong Qiu, Andreas Acrivos

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We present a method for measuring both the fluid and particle velocities in strong electric fields and carefully analyze the repeatability and reproducibility of the measurements. The experiments were conducted in 50-μm capillaries containing dilute aqueous suspensions of 4-μm polystyrene spheres subjected to dc as well as ac (5-50 Hz) fields of strengths up to 1 and 0.6 kV/cm, respectively. These measurements indicate that the predictions of classical linear theories for electrokinetic phenomena apply well beyond the range of relatively weak electric fields for which these theories were developed. The results of our studies are critical for the quantification of microanalytical systems which make use of electrokinetic phenomena for the transport, control, and manipulation of fluids and particles.

Original languageEnglish (US)
Article number123301
JournalPhysics of Fluids
Issue number12
StatePublished - Dec 2006

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


  • Electrohydro dynamics
  • Electrokinetic effects
  • Flow measurement
  • Microchannel flow
  • Non-Newtonian flow
  • Pipe flow
  • Polymer solutions
  • Suspensions
  • Two-phase flow


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