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Investigation of Two-Fluid Flow Contains Oil and Water in Hydrocyclones

Maddahian, Reza | 2012

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 43240 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan; Firoozabadi, Bahar
  7. Abstract:
  8. Having an efficient and reliable system for oil-water separation especially in offshore oil and gas industry is of crucial importance. Due to the platform movement, space, weight and operating limitations in offshore industries, using common methods, (e.g. gravity based vessels), for oil-water separation is ineffective. On the other hand, producing oil on offshore platforms is often accompanied by large discharge of oil-contaminated water into the sea, resulting in environmental pollution. Therefore a need for high efficiency compact separators capable of operation in various operating conditions arises. One solution to the mentioned problem is the use of hydrocyclone separators. The advantages of the hydrocyclones compare to other methods are that of simple design, easy installation and operation, lack of moving parts, low manufacturing and maintenance costs. In this research the deoiling hydrocyclones flow field is investigated numerically. At first, a multiphase code is developed based on two fluid finite volume method. The mixture approach of Reynolds Stress Model is also employed in order to capture features of turbulent multiphase swirling flow. The velocity field, separation efficiency and effective geometrical parameter of deoiling hydrocyclone are investigated. Also the comparison between the estimated separation efficiency of Euler-Euler and Euler-Lagrange is performed. In the second part of present research, the Mechanistic model of deoiling hydrocyclone is introduced. The model is capable of predicting swirl intensity and velocity field of continous phase. The separation efficiency of deoiling hydrocyclone in Mechanistic model is predicted using Lagrangian approach. At the last, the geometry of deoiling hydrocyclone is optimized using the developed numerical approach and Mechanistic model. This research is useful to get a better understanding the multiphase flow field inside deoiling hydrocyclones. The obtained results can be used for optimized design of deoiling hydrocyclones for various operating conditions
  9. Keywords:
  10. Deoiling Hydrocyclone ; Numerical Simulation ; Eulerian-Eulerian Approach ; Eulerian-Lagrangian Approach ; Mechanistic Model

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