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Simulation of Mass Transfer from Droplet in a Two Phase Liquid-liquid Extraction System

Fahim Alavi, Morteza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45882 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein; Firoozabadi, Bahar
  7. Abstract:
  8. Mass transfer of a drop moving in a bulk fluid is an interesting subject which has attracted a lot of attention. Understanding effective parameters in this process would be helpful in order to increase the efficiency of the industrial processes related to mass transfer. In this research, the deformation and mas transfer of a moving drop was studied numerically. Navier-Stokes equations and concentration equation were solved separately with a VOF method in an axisymmetric domain using Fluent software. Comparision between numerical results and former experimental results proves the accuracy of the modelling in both fields of deformation and mass transfer. Moreover, effects of the physical properties of the drop phase and bulk phase were investigated on the mass transfer process. Results indicate that by decreasing the surface tension or increasing the dro diameter, the rate of mass transfer deccreases. This is due to the movement of the mass transferd to the bulf fluid around the drop surface which decreases the concentration difference of the bulk fluid and drop surface. This can be seen easily through stream lines around the drop. In order to extend the results for different cases, results were represented in terms of dimensionless numbers of Weber (We), Reynolds (Re) and Ohnesorge (Oh) which are the ratio of inertia force to surface tension force, inetia force to viscous force and viscous force to surface tension force respectively. Rsults show that mass transfer in inversely related to weber number and it is proportional to Reynolds number. Both above numbers can be summarized in Ohnesorge number and it can be concluded that mass transfer is inversely related to Ohnesorge number and by increasing the Ohnesorge number, the rate of mass transfer can increase up to 60 percent
  9. Keywords:
  10. Drop Deformation ; Volume of Fluid ; Weber Number ; Mass Transfer ; Ohnesorge Number ; Reynolds Number ; Liquid-Liquid Extraction

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