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CFD Simulation of Dispersed Drops in Contact with Different Coalescers for Liquid-Liquid Separation

Mehdizadeh Chelebari, Yasin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49477 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah
  7. Abstract:
  8. Liquid-Liquid coalescers are devices used for increasing the droplet size of the dispersed phase in continuous phase flow such as water droplets in oil flow. The scope of this work is a literature study on the coalescence phenomenon and CFD modeling in general. A mathematical model for simulating coalescence of water droplets in continuous oil flow by the use of different commercial coalescers. The basis for the model are plate-type coalescer and swirl-based coalescer. So, the simulations are done by Eulerian-Lagrangian method. Different aspects of the performance of the coalescers are studied on the rate of coalescence such as impact of changing droplet’s inlet diameters, impact of the dispersed phase volume fraction, velocity of dispersed phase, type of continuous phase flow and geometry of the coalescer. Coalescers can have different surface characteristics /properties with regard to hydrophilicity(H) and oleophilicity(O). Water contact angle vary from surface to surface. This surface characteristic has significant impact on the coalescence of the dispersed droplets. In this thesis, the mechanism of coalescence of two water droplets has also been studied through CFD simulation by VOF method. The result of this study imply that the viscosity of the continuous oil phase is the most significant among the hydrodynamic parameters. It determines the resistive film thining force. The result of this study are good generalization for the result of previous work
  9. Keywords:
  10. Coalescence ; Contact Angle ; Simulation ; Computational Fluid Dynamics (CFD) ; Droplets Coalescence ; Liquid-Liquid Separation ; Suspension ; Coalescers ; Water Droplet

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