Modeling of Flow of Nano-filled Viscoelastic Fluids and its Application in Rheometry

Kamyabi, Mohammad Mahdi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45047 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. Despite of passing many years from invention of Computational Fluid Dynamics (CFD), simulation of the fluid-solid interfaces and free surfaces are still completely challenging and progressive problems. In addition knowing and understanding nanotechnology huge applications,modeling of nano-fluids have been became a priority for researchers. Adding importance of Non-Newtonian fluids (especially polymeric solutions) to this two subjects, triangle topics of this research becomes vivid. In this research tried to consider and examine behavior of Newtonian,Generalized-Newtonian, Viscoelastic and nano-filled viscoelastic fluids in one and two phase mediums. we followed mesh free methods which are more powerful in order to model fluid-solid two phase problems. Lagrangian view and mesh free nature, these methods allow modeling of more complex geometries and moving fluid-solid boundaries. Within all these methods, Smoothed Particle Hydrodynamics (SPH) has been chosen.This research has been done in two major sections. In the first section the prepared software and the numerical method have been validated through comparing results of cavity and falling problem for Newtonian fluid with available valid results in the literature. Solving the problem of falling a cylinder in some different kind of fluids is the continuation of this section where finding the effects of different factors is the goal. Addition of being classic, what makes this problem applicable and important is possibility of using its result in order to design falling ball (cylinder) rheometer which may be used to find rheological characteristics of such fluids.This is done by using Neural Networks concepts. In the second section,it is tried to verify some of the results of the previous section by experiments. Although matching all conditions of simulation with reality was impossible, we attempted to consider some parameters such as polymer solution concentration and nanofibers concentration on the falling behavior of the cylinder
  9. Keywords:
  10. Nanofluid ; Non-Newtonian Fluids ; Smoothed Particle Hydrodynamics (SPH) ; Falling Cylinder ; Fluid-Solid Interface

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