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Effect of variable Geometry on a Vertical Two Phase Flow

Karimi Dehkordi, Farhad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 46901 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Nouri Borujerdi, Ali
  7. Abstract:
  8. The aim of this research is to consider the effect of geometric changes on pumping performance of two phase gas-fluid flow in a vertical pipe. The idea is to inject a light gas to the bottom of a tube full of fluid so we will obtain an upward flow due to density differences. Potential benefits of this device are numerous such as dredging of river estuaries and harbors, sludge extraction in sewage treatment plant, water treatment and many others. There are almost four distinct flow patterns which occurs in the rise pipe, bubbly flow, slug flow, churn flow and annular flow that each of them require special conditions. heat transfer between two phases, phase changes, mass and volume rate of fluid and gas, shape of riser tube and size of it are some of the conditions that govern the flow pattern in the riser tube. There are so many researches considering a vertical two phase flow but less information about pumping performance of a two phase flow in a vertical pipe with nonuniform cross section area are available. Here we are going to examine a riser tube with changes in flow cross section area. For this purpose, an air-lift pump was designed and tested. Experiments were performed for different submergence ratios and three tubes with different diameters other shapes for riser tube has been also fabricated such as a channel with cross section area of 3cm*3cm and a trapezoid shape with the size of 3cm*43cm*10cm.The present results showed that the pump capacity and efficiency are functions of the air mass flow rate, submergence ratio, and riser pipe length
  9. Keywords:
  10. Two Phase Flow ; Cross Section Variable ; Airlift Pump ; Vertical Tube

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