Numerical and Experimental Study of Transient Flow Properties in Viscoelastic Pipe Network Using Inverse Analysis

Document Type : Research Paper

Authors

1 chamran univercity

2 Professor, Hydraulic Structures Department, Shahid Chamran University of Ahvaz, Iran.

3 Expert of Khuzestan Water and Sewage Co. , Ahvaz, Iran

Abstract

The analysis of transient flow plays a critical role in designing pipe systems and pipe networks. Controlling and collecting the pressure wave signals at proper spots in the pipeline can provide much information about the system. Many researchers have studied transient flow and the loss caused by unsteady flow. Most studies have been so far conducted on the transient flow in a simple pipeline made up of steel and concrete. Since few research has been done on transient flow in more complex systems and plastic pipes, the present paper investigates the numerical and experimental model of transient flow and its properties in polyethylene pipe networks in time domain. In this study, by collecting transient signals of the pipe network, unknown parameters are calibrated and extracted by inverse analysis of the transient flow for different discharges. The pressure signal properties in polymer pipes are also compared with discharge variations. The results showed, that the best state for calibrating the polyethylene pipe network numerical model is to consider only the viscoelastic effect of the pipe wall with 1 Kelvin-Voigt element. The creep functions of the viscoelastic model were calculated at different steady state discharges and it was shown that with increasing discharge, the creep function decreases.

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History

  • Receive Date: 31 December 2019
  • Revise Date: 14 July 2020
  • Accept Date: 02 August 2020
  • First Publish Date: 02 August 2020

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