IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 2- HYDRO-ENVIRONMENT : THE INVESTIGATION OF FRESH WATER POLLUTION IN PIPE NETWORK DUE TO WATER HAMMER
THE INVESTIGATION OF FRESH WATER POLLUTION IN PIPE NETWORK DUE TO WATER HAMMER
Author : MILAD PAYESTEH , ALIREZA KERAMAT & MASOUD ANISSHOSEINI
This paper clarifies the possibility of fresh water pollution in pipe networks following a water hammer event. The water hammer phenomenon in a pipeline produces rapid changes in the fluid pressure which travel along the pipeline as a pressure wave. If e.g. the water hammer is generated due to an instantaneous valve closure of a downstream valve, the pressure wave transforms to rarefaction waves at moments after the half water hammer period. This negative pressure can suck materials from probable leaks on pipe into fresh water and pollutes it. The situation is worst especially when the pipeline is buried and the level of ground water is higher than the pipe elevation. This paper demonstrates as to how pollution can move from leaks into the pipeline due to water hammer and how it is mixed with fresh water and travels at different points of pipe by means of advection and diffusion mechanisms. To simulate this phenomenon, firstly, the water hammer equations are solved to predict the pressure and velocity distributions along the pipeline. These flow characteristics are then used to solve the advection-diffusion equation assuming some leaks as nodal boundary conditions. The simulation predicts the concentration of pollution at several points of the pipeline. The investigation is further extended to pipe networks. The results show the extent of pollution that spreads in pipe system from a leak with time progress after a water hammer event.
File Size : 579,212 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 2- HYDRO-ENVIRONMENT
Date Published : 18/04/2016
Download Now