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An Investigation to the Effect of Heterogeneity of Surface’s Potential on Mass Transport and Surface Reaction Kinetics in Microreactors

Abodllahzadeh, Mojtaba | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48022 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Saeed
  7. Abstract:
  8. Nowadays, technology has facilitate the miniaturization of laboratory systems, medical and drug delivery tools. As a result, researchers are interested to miniaturize these tools. The extensive research in this field led to invention of lab-on-a-chips, which with the size of a few µm to a few mm, can do multiple tasks in human body. One of most important components of these devices, is microreactor. A wide range of measurements and reactions in microreactors, need to bind with the receptors at the surface of the cylindrical microchannels. For this purpose, this study, investigates the effects of surface heterogeneity on microreactors performance. In this Thesis, the governing equations were derived and nondimensionalized. To solve these equations, numerically, they were discretized with FVM method and then solved by the developed C++ code. Afterwards by changing each one of effective parameters in mass transport and surface reaction, effect of surface heterogeneity were investigated. The results showed that if Da or Pe is less than one, then the non-uniform zeta distribution does not affect the saturation time. But when both these numbers are greater than one, surface potential heterogeneity, will decrease the saturation time. After that, other parameters effect, were also investigated. And eventually the by depicting the concentration contours and streamlines, it was explained that why making the surface zeta potential distribution, non-uniform will decrease the saturation time
  9. Keywords:
  10. Electroosmotic Flow ; Numerical Modeling ; Mass Transfer ; Surface Reactions ; Microreactor ; Nonuniform Zeta Potential

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