Manipulation of particles using dielectrophoresis

J. Kadaksham, P. Singh, N. Aubry

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

A numerical scheme based on the distributed Lagrange multiplier method (DLM) is used to study the motion of particles of electrorheological suspensions subjected to non-uniform electric fields. At small Reynolds number, the time taken by the particles to collect at the minimums or maximums of the electric field is primarily determined by a parameter defined to be the ratio of the dielectrophoretic and viscous forces. Simulations show that in non-uniform electric fields the collection time is also influenced by a parameter defined by the ratio of the electrostatic particle-particle interaction and dielectrophoretic forces. The collection time decreases as this parameter decreases because when this parameter is less than one, particles move to the regions of high or low electric field regions individually. However, when this parameter is greater than one, particles regroup into chains which then move toward the electric field maximums or minimums without breaking. It is also shown that when the real part of the Clausius-Mosotti factor (β) is negative the positions of the local minimums of the electric field, and thus also the locations where particles collect, can be modified by changing the electric potential boundary conditions.

Original languageEnglish (US)
Pages (from-to)108-122
Number of pages15
JournalMechanics Research Communications
Volume33
Issue number1
DOIs
StatePublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)
  • Civil and Structural Engineering

Keywords

  • Dielectrophoresis
  • Direct numerical simulations
  • Distributed Lagrange multiplier method
  • Electrorheological suspensions
  • Finite-element method

Cite this