Numerical Simulation and Analysis of Electrokinetic Micromixer

Raffiee, Amir Hossein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45410 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Said
  7. Abstract:
  8. Lab-On-A-Chip is a micro-scale system which utilizes specific tools in order to operate detection tests on samples. One of the most important components of these devices is micromixers which is responsible for appropriate mixing of samples in short period of time. The biggest problem associated to the mixing in micro-scale is the regime that the flow takes during the process. Due to the small dimensions of micromixers the induced flow stream resides in the range of laminar flows and consequently the mixing is conducted solely by diffusion mechanism which is either time-taking or requires long micro-channel that causes the high cost of fabrication. In order to improve the mixing process two major strategies have been adopted in which these devices are categorized into two types of passive and active. The first type attempts to increase the mixing rate via complex geometrical configuration of micro-channel and the latter takes advantage of external source of energy to enhance the process.
    In this research, the chaotic electric field is generated in micromicer domain to improve the mixing as an active approach and numerical studies are performed to investigate the effectiveness of utilized strategy using Rayan code, particularly composed for electrokinetic problems. The results reveal that the performance of the micromixer depends to a great extent on the geometry and flow condition and desired mixing achieved merely by proper change made in each of the relevant parameters
  9. Keywords:
  10. Lab-on-a-Chip ; Active Micromixer ; Electrokinetic Choas ; Modeling ; Numerical Solution

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