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Investigating Rheology of Microgels in Dilute and Concentrated Suspensions

Etemadi Dailami, Mohammad Hossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47298 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Mohammadi, Ali Asghar
  7. Abstract:
  8. For designing a unit operation, knowledge about physical properties is essential. This is attained either by direct measurement, which needs spending time and cost or, using proposed correlations. This project is subjected to theoretical analysis of viscosity as the most important rheological property of dilute suspensions of microgels, or in other words colloidal suspensions of porous spheres. They are applied in drug delivery, enhanced oil recovery, synthesis of catalyst and adsorption of heavy metal ions from aqueous systems for water purification purposes. In dilute suspensions particles are faraway from each other and there is no interaction between them therefore, it is better to determine velocity profile inside and outside a single particle and sum the contibutions as a whole. Momentom equations for Newtonian fluid in free fluid and porous sphere are Navier-Stokes and Brinkman equation in creeping regime. In two dimensional flow, velocity profile was determined by using stream function method and in three dimensional flow, it was derived by vector harmonic functions. Based upon the idea of hydrodynamic stress of suspension and volume averaging, intrinsic viscosity was calculated. The procedure of solving momentum equations in three dimensions subjected to a porous sphere is a new one, that was not used before and has easier mathematics. The result confirmed the previous researches
  9. Keywords:
  10. Suspension ; Volume Averaging Method ; Rheology ; Intrinsic Viscosity ; Microgel ; General Linear Flow

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