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Carrying Capacity of Perforated Pipes in Submerged Area

Nabaei, Milad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41740 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Borghei, Mahmoud
  7. Abstract:
  8. Selective withdrawal from water and settlement reservoirs and tanks is necessary for water and environmental systems. Perforated pipes can be used for selective withdrawal within the length of these reservoirs. In this method, the lateral inflow through perforations leads to the outlet of the pipe that is placed in a depth of fluid. In relation to the hydraulics of perforated pipes, most studies are about drainage pipes and perforated pipes that are used as wellbores in horizontal wells, but application of these pipes have not been investigated in submerged situations. Capacity estimation of perforated pipes based on inside diameter of the pipe, material of the pipe, perforations of the pipe and other hydraulics conditions is important in design of these pipes. In this research, laboratory experiments have been carried out on perforated pipes with 26.5 and 43.5 mm inside diameters. Experiments have been done with changing of water depth on the pipe, longitudinal slope of the pipe, number of perforations and arrangement of them. In addition, the effects of outlet condition (free or submerged outlet) on carrying capacity were also studied. Experiment results show that in lower permeability of perforated pipes (measured as a ratio of the surface area of all perforations to the internal surface area of the pipe wall), lateral inflow is more uniform along the pipe and with increase of pipes permeability, carrying capacity of the pipe increase upto a specific limit. Experiments also showed that changing of perforations arrangement on the pipe in lower permeability and high ratio of perforation diameter to the pipe inside diameter, causes changes in carrying capacity of the pipe.


  9. Keywords:
  10. Selective Withdrawal ; Experimental Method ; Perforated Pipes ; Submerged Area ; Carrying Capacity

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