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Combined Electroosmotically and Pressure Driven Flow of Power-Law Fluids in Rectangular Microchannels

Vakili, Mohammad Ali | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43779 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Mozafari, Ali Asghar
  7. Abstract:
  8. Electroosmosis is the predominant mechanism for flow generation in lab-on-a-chip devices. These microfluidic devices are microscale laboratories on a microchip that can perform clinical diagnoses. Since most biofluids encountered in these devices are considered to be non-Newtonian and the cross section of microchannels in these devices is close to a rectangular shape, In this study, the hydrodynamically and thermally fully developed combined electroosmotically and pressure driven flow of power-law fluids in rectangular microchannels is analyzed. The governing equations are first made dimensionless and then transformed into new ones based on the computational parameters which provide mesh clustering near the wall and after that are solved numerically thorough a finite difference procedure. The results reveal that in the case of favorable pressure gradient, the Poiseuille number and the flow rate are increasing functions of channel aspect ratio and decreasing functions of flow behavior index, while the opposite trends are seen in the case of adverse pressure gradient. It is also found that, increasing the dimensionless Debye-Hückel parameter and the zeta potential will increase both Poiseuille number and mean velocity. Furthermore, the Nusselt number could be either an increasing or decreasing function of the flow behavior index. Moreover, the energy generated due to viscous dissipation will increase by decreasing the channel aspect ratio
  9. Keywords:
  10. Electroosmotic Flow ; Power-Low Fluid ; Viscous Dissipation ; Joul Heating ; Microfluidic System

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