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Experimental Study of Hydraulic Characteristics of Perforated Pipes in Submerged Area

Olyaei, Mohammad Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44402 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mir Mosaddegh
  7. Abstract:
  8. In small settling tanks, the sludges can be removed using perforated pipes. In this method the pipe is placed in the depth of a fluid and the lateral inflow through perforations lead to the outlet. Since there are few researches about hydraulic characteristic of perforated pipes, this research will investigate the hyadraulic characteristic of these pipes experimentally. One of the main objectives of these pipes is to use the entire lenghte of the pipe and also provide the uniform distribution of inflow. In the past studies, it was found out that inflow mostly comes through downstream perforations. The objective of this research is to find the distribution of discharge along the perporated pipes in submerged area. For aiming this, perforations were made in pipes with 1 and 2 inch diameter and also for separating the pipe, an internal wall was placed in the middle and last one-third of the pipe. In addition, the density of perforations in the upstream of pipe was increased and the experiments were carried out again. Expermints have been done with changing the depth of water above the pipe and number of the perforations. In the last part with comparing the experimental pressure profile with theoretical one, the coefficient of presure drop was determined. Results showed that in pipes with lower diameter, for uniforming the inflow thorugh perforations, the permeability in downstream half of the pipe should be considerably lower than the permeability in upstream half of the pipe. Furthermore, it was find out that increasing the density of perforations in upstream part of pipe has no noticable effect in discharge along the perporated pipes
  9. Keywords:
  10. Perforated Pipes ; Submerged Area ; Experimental Investigation

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