Study of the Effect of Presence of Nano- Particles on the Mass Transfer and Hydrodynamics of Drops

Nozari, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44685 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh; Goodarznia, Iraj
  7. Abstract:
  8. Regarding to the effect of nanoparticles on mass transfer and hydrodynamics characteristics, limited number of studiesavailableinthe literature.In this work, mass transfer performanceand hydrodynamic characteristics nanofluidshavebeeninvestigated in the liquid−liquid extraction process. The chemical system of toluene-acetic acid-water was used, and two Extraction columnswith diameter of 10cm and height of 55cm and 6 cm were designed. The drops were organic nanofluids containing silica nano-particles and carbon nano-tubes.Synthesized silica nanoparticles by sol-gel methods, were modified with Triethoxyoctylsilane and Polydimethylsiloxane as well as Carbon nano-tubes were modified with dodecyl iodide for hydrophobicity and ease of dispersion in the organic phase and were then characterized using different methods such as Ft-IR, SEM, Contact Angle, UV-Vis,Helium pycnometer. Maximum enhancements in the mass transfer coefficient were achieved119% and 116% for silica nano-particle and 27% for carbon nano tubes.However, a decreasing variationwas observed at higher concentrations. The diameter and terminal velocity of drops were slightly decreased with increasing the concentration of nano-particles. In addition, a small amount of nano-particles were present in the continuous phase
  9. Keywords:
  10. Nanosilica ; Mass Transfer ; Liquid-Liquid Extraction ; Carbon Nanotubes ; Nanofluid ; Droplet Formation Hydrodynamics

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