Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Development and Validation of Numerical Program for Predicting Electrokinetic and Dielectrophoretic Phenomena in a Microchannel

미소채널 내 전기역학 및 유전영동 현상 해석을 위한 수치 프로그램 개발 및 검증

  • 권재성 (한양대학교 기계기술연구소) ;
  • 맹주성 (한양대학교 기계공학부) ;
  • 송시몬 (한양대학교 기계공학부)
  • Published : 2007.04.01
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Abstract

Electrokinesis and dielectrophoresis are important transport phenomena produced by external electric field applied to a microchannel containing a conductive fluid. We developed a CFD code to predict electrokinetic and dielectrophoretic flows in a microchannel with a uniform circular post array. Using the code, we calculated particle velocities driven by electrokinesis and dielectrophoresis, and conducted Monte Carlo simulations to visualize the particle motions. The code was validated by comparing the results with those from previous studies in literature. At a low electric field, electrokinesis and diffusion is the dominant transport mechanism. At a moderate electric field, dielectrophoresis is balanced with electrokinesis and diffusion, resulting in flowing filaments of particles in the microchannels. However, dielectrophoresis overwhelms the flow at a high electric field and traps particles locally. These results provide useful insight for optimizing design parameters of a microfluidic chip for biochemical analysis, especially for development of on-chip sample pretreatment techniques using electrokinetic and dielectrophoretic effects.

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References

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