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Experimental and CFD Study of Physical Properties Effect on Hydrodynamic and Mass Transfer Coefficient of Single Drops

Davari Moghaddam, Abbas | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42400 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh
  7. Abstract:
  8. In present study, it is tried to investigate the effect of physical properties on hydrodynamic and overall mass transfer coefficient of single drops using different experiments and then simulation of drop motion with OpenFOAM software version 1.7.1. the systems were choosen are toluene/acetone/water and n-butanol/succinic acid/water which their interfacial tensions are 36 and 1.6 mN/m respectively. Various type of nozzles have been used for produce of 1.5, 2, 3 and 4 millimeter drops. The results show that in absence of solute component, the rising velocity of toluene drops in each size is higher than rising velocity of butanol drops inside the water between 25 to 75 percent. But with adding the solute component, the rising velocity of toluene drops decrease about 45 percent, whereas the rising velocity of butanol drops increase at first and decrease in continue. Also the results show that, the overall mass transfer coefficient of single drops in toluene/acetone/water system is 1.2 to 3 times higher than n-butanol/succinic acid/water system. The reason of this different at first is due to the high diffusion coefficient of acetone inside the toluene ( ) against the succinic acid inside the butanol ( ), and also is due to the Marangoni effect that result from interfacial tension gradient due to the solute gradient along the interface of toluene drops and water, then with increase of agitation inside the drops increase the mass transfer coefficient. The result of simulated model for drops without the solute component are in agreement with experimental data with an error less than 10 percent, but with adding the solute, the results have acceptable accuracy for n-butanol/succinic acid/water system that have low interfacial tension
  9. Keywords:
  10. Physical Properties ; Mass Transfer Coefficient ; Interfacial Tension ; Marangoni Effect

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