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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : 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 (1), ALIREZA KERAMAT (2) & MASOUD ANISSHOSEINI (3)
ABSTRACT
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 : 309,835 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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