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107116

Simulation of Water Hammer in Viscoelastic Pipes.

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Last updated: 04 Jan 2025

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Mechanical Power Engineering

Abstract

The mechanical behavior of the pipe material affects the pressure response of a fluid system during water hammer. In viscoelastic pipes, the pressure fluctuations are rapidly attenuated, and the pressure wave is delayed in time. This is due the retarded deformation of the pipe -wall. In this work, a mathematical model to simulate water hammer in viscoelastic pipes taking into account the viscoelastic behavior of pipe walls, applying the Kelvin- Voigt model, has been developed. The developed model was solved using the method of characteristics (MOC), neglecting fluid-structure interactions (FSI) and unsteady friction effects. The model results were tested against the experimental results obtained by Covas et al. [1[, which carried out on a high-density polyethylene (HDPE) pipe-rig at Imperial college, London. The effects of time step and wave speed were studied. The pressure fluctuation obtained with the proposed viscoelastic model showed a good agreement with the experimental results. Conversely, the pressure obtained by the elastic model solution showed a large discrepancy with the experimental and numerical data. The time step affected the pressure-head wave amplitude and frequency, while wave speed affected only the wave frequency. The best results were obtained at higher time step values, corresponding to a Courant number ranging from 0.983 to unity, as the average amplitude and frequency of the numerical solution are 96%and 95.1% of their corresponding values for the experimental results, respectively. The best wave speed was at about 388.7 m/s.

DOI

10.21608/bfemu.2020.107116

Keywords

Water Hammer, Viscoelasticity, Methods of Characteristics, Courant Number, Wave Speed

Authors

First Name

Hassan

Last Name

Mansour

MiddleName

-

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

Email

-

City

-

Orcid

-

First Name

M.

Last Name

Mohamed

MiddleName

Safwat

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

Email

msafwat@mans.edu.eg

City

-

Orcid

-

First Name

Berge

Last Name

Djebedjian

MiddleName

-

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, El-Mansoura 35516, Egypt

Email

bergedje@mans.edu.eg

City

-

Orcid

-

First Name

Mohamed

Last Name

Tawfik

MiddleName

-

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

Email

m.m.h.tawfik@mans.edu.eg

City

-

Orcid

-

Volume

38

Article Issue

3

Related Issue

16051

Issue Date

2013-09-01

Receive Date

2013-08-02

Publish Date

2020-08-11

Page Start

54

Page End

65

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 38_Issue 3_Pages 54-65.pdf

PDF . 467.4kB

Link

https://bfemu.journals.ekb.eg/article_107116.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=107116

Order

13

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Simulation of Water Hammer in Viscoelastic Pipes.

Details

Type

Article

Created At

22 Jan 2023