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Numerical Modeling of Electroosmotic Flow of Viscoelastic Fluids in Hydrophobic Microducts

Abdoli Farzaneh, Hassan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49870 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. The integrated development of small-scale electronic and mechanical systems has drawn attention, since they lead to increase in speed and decrease in volume of industry dimensions in the manufacturing sector. That is why microelectromechanical systems are highly considered. MEMS are widely used in Microfluidic systems that can be used in medicine, biology and drug injection. Due to the fact that consistent fluid velocity is necessary in biological applications, electroosmotic flow is more important than ever. To investigate the behavior of biofluids, Newtonian models cannot be used and it is required to use models that predict the behavior of these fluids accurately. In this research electroosmotic flows with viscoelastic fluid pressure gradient within a rectangular micro-channels with hydrophobic surfaces are investigated. The governing equations are introduced for the distribution of electric potential and velocity and are non-dimensionalized by using appropriate parameters. A suitable coordinate transformation is used to examine the effect of wall and Electrical Double Layer (EDL) on which they are formed. The achieved equations are discretized in the new coordinate system and are solved by the finite volume method. The study attempts not to use simplifying assumptions such as Debye-Huckel approximation. The results of the study indicate that several factors such as the thickness of the Electrical Double Layer, Zeta Electrical Potential and the slip factor will influence the distribution of electric potential and the internal speed of the micro-channels. The increase of each of these factors can lead to multiplied speed in center of the micro-channels. A comparison is also conducted between Newtonian and Viscoelastic fluids. Fluid elasticity is introduced as an important factor in the velocity which can itself be one of the most influential parameters on the flow behavior
  9. Keywords:
  10. Electroosmotic Flow ; Approximation ; Numerical Solution ; Fluids ; Viscoelastic Fluids ; Hydrophobicity ; Microchannel

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