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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 40814 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Farhadi, Fatollah
- Abstract:
- Investigation of particles (bubbles or droplets) behavior in two phase flow is widely studied in many chemical engineering processes. This thesis describes CFD simulation for study of dispersed droplets behavior in two phase flow. For this purpose, in population balance equation which is coupled with mass balance equation, Lou and Svendsen model is used for breakage and Prince and Blanch model for coalescence with Eulerian-Eulerian approach for multiphase flow, in conjunction with turbulence model. Then the effect of gas velocity on the coalescence and break up phenomena studied and the results obtained here showed that by increasing gas flow rate, which increased , leads to increase droplets breakage. It is investigated the effect of liquid phase concentration in gas flow on breakage and coalescence phenomenon. This study showed that by more concentration of dispersed liquid phase in the gas flow due to the increased probability of the collision, which is the main factor in coalescence phenomenon, the coalescence will be dominate on breakage. And particle size distribution towards larger droplet sizes has willingly. Also the effect of fluid type on breakage and coalescence phenomenon is studied. For this purpose, three kinds of liquids as turpentine, toluene and n-hexane are used in simulation. Fluid density and viscosity of these three are approximately same, but differ in surface tension. The simulation result showed that in similar conditions, the breakage rate of hexane droplets due to less surface tension is more. Finally, the effect of the input geometry on droplet size distribution has been studied. For this purpose, the tangential flow is used as input. It was shown that due to more probable collision of droplets especially near the walls, the coalescence phenomenon dominate the breakage and leads to more bigger droplets.
- Keywords:
- Refraction ; Particles Size Distribution ; Computational Fluid Dynamics (CFD) ; Coalescence Phenomenon ; Gas-Liquid Flow
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محتواي پايان نامه
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