Investigation of Mass Transfer in Liquid-Liquid System in the Presence of Nanosized Particles

Nakhaeipour, Fahimeh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40351 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Dariush
  7. Abstract:
  8. The main objective of this project is to study the effect of the presence of nanoparticles on mass transfer in liquid-liquid systems. To do this research, TiO2/water, Al2O3/water, CNTs/water and CNTs/toluene have been used as nanofluids. The experiments of TiO2/water nanofluid were been carried out in water-acetone-toluene system at two weigh percents of TiO2 nanoparticles. The result showed that mass transfer decreased in 0.5wt% of TiO2, compared to base fluid, and it increase in 1 %wt. Also in 0.5%wt the decrease in interfacial tension decreased diameter of drops and as a result mass transfer decreased too. In 1%wt the increase in viscosity increased the diameter of drops and then the droplet mass transfer coefficient increased. This means the overall mass transfer increased too. Also the increase in inlet flow rate decreased the mass transfer enhancement at this weight fraction. To prepare nanofluids water/CNTs and toluene/CNTs, surface of the carbon nanotubes were treated with carboxylic acid and organic groups in order to be hydrophilic and hydrophobic, respectively. Then nanotubes were dispersed by ultrasound. Also for preparation of Al2O3/water nanofluid, acrylate acid sodium was added to water partly. These three nanofluids were used in water- acetic acid- toluene system. The effect of three parameters such as concentration of nanoparticles, the flow rate of inlet dispersed phase and primary acid concentration were investigated on mass transfer enhancement. The results showed that the increase in nanoparticles and decrease in primary acid concentrations increased mass transfer. Also the increase in flow rate of the dispersed phase decreased mass transfer enhancement until in turbulence regime the mass transfer rate approached to the base fluid.
  9. Keywords:
  10. Nanofluid ; Mass Transfer ; Hydrodynamics ; Liquid-Liquid Extraction

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