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Preparation of Nanofluid by Using Hybrid Nanostructures and Investigation of Thermal and Rheological Properties and Using it in the Petroleum Fluids

Baghbanzadeh, Mohammad Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42149 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian , Davood; Rashidi, Alimorad; Lotfi, Roghayeh
  7. Abstract:
  8. In this study, thermal and rheological properties of nanofluids of water/carbon nanotubes, water/spherical silica nanoparticles and water/hybrid nanoparticles (hybrid of carbon nanotubes and spherical silica nanoparticles) have been investigated. To do so, carbon nanotubes have been synthesized by CCVD process and spherical silica nanoparticles and hybrid nanoparticles by wet chemical method. After synthesis of nanomaterials, nanofluids have been prepared by using SDBS as a dispersant with the concentration of 1.5 times of concentration of nanomaterials and then thermal conductivity, kinematic viscosity, dynamic viscosity and density of nanofluids have been investigated. As the results show, carbon nanotubes with the concentration of 1% (wt.) at the temperature of 40℃, have produced the most increase in thermal conductivity of base fluid (23.3%) among the other nanomaterials. The least increase in kinematic and dynamic viscosity of nanofluids has belonged to nanofluid of water/hybrid nanoparticles with the less carbon nanotubes (20% carbon nanotubes and 80% spherical silica nanoparticles) with the concentration of 0.1% (wt.) of nanoparticles at 20℃ (0.9% and 0.08%, respectively). Finally, increase in density of nanofluid has been negligible that at the worst conditions it doesn’t exceed the amount of 0.9%. By considering the results in this study, hybrid nanoparticles with the more carbon nanotubes (50% carbon nanotubes and 50% spherical silica nanoparticles) have had the best operation
  9. Keywords:
  10. Nanofluid ; Carbon Nanotubes ; Viscosity ; Density ; Hybrid Nanostructures ; Spherical Silica ; Thermal Conductivity

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