Numerical Simulation and Characterization of an Electro-kinetic Micro-Mixer

Ghaderian, Sepideh | 2015

538 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47747 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Saeedi, Mohammad Saeed; Sani, Mahdi
  7. Abstract:
  8. Most of the current literature on the simulation of the electro-osmotic flow in micro-channels decompose electric potential to two components; internal and external potentials. They usually approximate the near wall changes in the ion concentration (called double layer) which is physically responsible for electro-osmotic force by a model (like Poisson equilibrium distribution or Debye-Huckel approximation). There are reports in the literature which show that the approximations lose their fidelity for more complex situations. In this thesis we solve the full system of Nernst-Planck and Navier-Stokes equations by resolving electric double layer. The proposed scheme is collocated polyhedral grid finite volume method as is embedded in the in-house code Rayan. Also addressed is the correct way of handling boundary conditions for the Nernst-Planck system. We present a novel high efficiency passive micro-mixer with mixing efficiencies as high as 99%. The design features flow lamination and embedding an obstacle in the mixing chamber to affect dead flow regions. The mixing design satisfies our goals efficient process with simple geometry and fast mixing. And the other benefit was smooth and stable flow, which is necessary for many bio-chemical process
  9. Keywords:
  10. Lab-on-a-Chip ; Electrokinetic Process ; Passive Micro-Mixer ; Rayan Code

 Digital Object List