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Implementing the Appropriate Numerical Method for Modeling the Two-Phase Flow in Upriser Pipe of Airlift Pump

Moezzi Najafabadi, Mahsa | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42394 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Airlift pumps are devices for lifting liquid phase incorporating the gas phase to be injected in the bottom of the liquid column. Gas-liquid two-phase flow being the main part of the flow through these systems, flowing in vertical pipes of airlift pumps has different regimes namely bubbly, slug, churn and annular. Generally these regimes appear starting from bubbly to annular from bottom to top of the upriser pipe. Gas/liquid multiphase flows occur in a wide range of natural and man-made situations such as boiling heat transfer, cloud cavitation, bubble columns and reactors in the chemical industry, cooling circuits of power plants, spraying of liquid fuel and paint, emulsions, rain, bubbles and drops due to wave breaking in the oceans and foam. Attempting to understand the flow of gas/liquid flows is therefore of major technological as well as scientific interest. Each numerical method to be appropriate for modeling a certain flow regime is considered, and then a suitable numerical approach which is crucial for correct simulation of gas-liquid flow in the upriser pipe of airlift systems is chosen. In this thesis, two main approaches namely the Volume Of Fluid (VOF) and the Eulerian model are used for modeling the two-phase flow in the airlift systems. Then the most appropriate method is chosen for modeling of two-phase flow in airlift pumps. The chosen method is applied for simulation of flow in airlift pumps with CFD package
  9. Keywords:
  10. Airlift Pump ; Gas-Liquid Two Phase Flow ; Volume of Fluid ; Numerical Solution ; Conical Upriser Pipe ; Eulerian Method

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