Solidification of Fluid Inside the Pipeline to Fix or Replace the Defective Component

Taheri, Mohammad Ali | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47667 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Pipe freezing has become well established in industry as a method of short-termisolation in order to carry out maintenance or repairs. It is often necessary to repair system components without plant shutdown or drainage of system having many piping structures which may have hazardous or expensive fluid. Therefore, a series of tests has been arranged to investigate the ice plug formation in two standard pipes with different diameter size. The freeze zone on the pipe has been created by means of an aluminum jacket which liquid nitrogen flows in it. In the tests the freezing time, amount of liquid nitrogen usage andthe pressure tolerance of ice plug have been determined. Moreover, the numerical simulation of freezing process in two and three dimension has been carried out to establish a solution method to determine the freezing time in other cases. To verify the numerical solution a comparison has been conducted between simulation and experimental results. The maximum differences between 2D and 3D result of freezing time with experiment are 11.8% and 2.9% respectively. Consequently, the effect of pipe diameter and liquid material on freezing time has been accomplished through two dimensional modeling due to the well prediction of 2D solution and its high convergence rate. The results show the freezing time grows exponentially with increase of pipe diameter
  9. Keywords:
  10. Solidification Time ; Two Dimentional Modeling ; Three Dimensional Modeling ; Ice Formation ; Numerical Modeling

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