Induced-Charge Electroosmosis Around Touching Metal Rods


Canpolat C., Zhang M., Rosen W., Qian S., Beskok A.

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, vol.135, no.2, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 135 Issue: 2
  • Publication Date: 2013
  • Doi Number: 10.1115/1.4023452
  • Journal Name: JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: induced-charge electroosmosis (ICEO), micro-PIV, electrical double layer, electrokinetics, PARTICLE, ELCTROOSMOSIS, FLOW, MICROCHANNEL, DRIVEN, MOTION
  • Çukurova University Affiliated: Yes

Abstract

Induced-charge electroosmosis (ICEO) around multiple gold-coated stainless steel rods under different ac electric fields is analyzed using microparticle image velocimetry (micro-PIV) and numerical simulations. In the present investigation, the induced electric double layer (EDL) is in weakly nonlinear limit. The ICEO flow around multiple touching rods exhibits geometry dependent quadrupolar flow structures with four vortices. The velocity magnitude is proportional to the square of the electric field. The ICEO flow velocity also depends on the cylinder orientation. The velocity increases with increased radial distance from the rod's surface, attains a maximum, and then decays to zero. Experimental and numerical velocity distributions have the same trend beyond 0.2 mm of the rod's surface.