Analysis and Design of an Electrokinetically-driven Micro-Mixer

Anbari, Ali Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41410 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Shafii, Mohammad Behshad; Saeedi, Mohammad Saeed
  7. Abstract:
  8. A Lab-On-A-Chip is a micro-scale system whic h utilizes some micro-scale components in order to implement detection tests on samples. One of the most important components of a lab-on-a-chip device is the micro-mixer, which is responsible for appropriately mixing of samples in a short period of time. The biggest problem relevant to mixing in micro scales is that since as the viscous forces are dominant in micro scale and dimensions are small, it is impractical to mix fluids via turbulence, and consequently mixing process is performed by diffusion mechanism. Two major strategies are being used in order to improve the mixing performance and two groups of micro-mixers, passive and active types, have been developed for this reason. The former, the passive type, improves the mixing via novel geometrical designs and the latter, the active type, utilizes an external source to help fluids mix better. In this research, electrokinetic chaos is used in order to improve the mixing as an active approach, and numerical studies are performed on an active micro-mixer by compiling C++ source codes in Fluent solver. The numerical simulation results indicate that the performance of a micro-mixer depends on the geometry and flow conditions as well, and a better mixing is considerably achieved by proper change made in each of these parameters. Considering these facts, we finally obtained a 95 percent mixing efficiency in about 0.21 seconds
  9. Keywords:
  10. Lab-on-a-Chip ; Modeling ; Numerical Solution ; Numerical Simulation ; Active Micromixer ; Electrokinetic Choas

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