Loading...

Numerical and Analytical Analysis of Electroosmotic Flow of Non-Newtonian Fluids with Temperature Dependent Properties in the presence of Pressure Gradient in a Slit Micro-Channel

Babaie, Ashkan | 2011

534 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41793 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan
  7. Abstract:
  8. Recent developments in MEMS related areas have increased the demand for practical and novel pumping methods. Utilizing Electroosmotic force for flow generation in microchannels has become really popular recently, because of its reliable operation and control. One of potential applications of MEMS devices is biological and medical analysis which most samples are considered to be non-Newtonian; consequently, thermal transport characteristics of non-Newtonian electroosmotic flow of power-law fluids is investigated in this paper. In this study, thermal and hydrodynamic behavior of non-Newtonian electroosmotic flow of power-law model in a slit microchannel is analyzed. It is assumed that the flow is fully developed and a pressure gradient would also affect the fluid flow inside the channel. Both numerical and analytical approach is used to simulate the flow inside the channel.
    In most related studies, different simplifying assumptions are used in order to lead to analytical solutions. These simplifying assumptions include Debye-Huckel linearization, constant joule heating distribution, neglecting the viscous dissipation term and also neglecting the variation of physical properties with temperature. In practice, it is not known that which of these simplifying assumptions would result in an accurate prediction of the flow behavior. In this paper, not only the original results from numerical solution is presented, but also a sufficient discussion has been made to evaluate the accuracy of the results based on the simplifying assumptions. Results show that, the non-Newtonian characteristics of the flow can lead to high deviations from Newtonian flow behaviors in specific situations; besides, it is seen that the Debye-Huckel approximation could result in significant errors in some cases
  9. Keywords:
  10. Electroosmotic Flow ; Power-Low Fluid ; Microfluidic System ; Joul Heating ; Debye-Huckel ; Viscous Dissipation

 Digital Object List

 Bookmark

No TOC