Calculation of Chlorine and Fluoride Diffusion/Dispersion Coefficients in Water Supply Pipes
Publication: Journal of Water Resources Planning and Management
Volume 147, Issue 7
Abstract
The present study was designed to report experimental results for effective diffusion and longitudinal dispersion coefficients for both chlorine and fluoride added to water supply pipes. This is the first extensive study to find effective diffusion and dispersion coefficients for chlorine and fluoride added to water supply pipes. A pipe of field diameter and length was used to find dispersion coefficients for both chlorine and fluoride. The study covers the Reynolds number (R) from laminar and transitional flows (), for which more correct information about the dispersion coefficients might be needed in the literature. The paper first presents the solution of a two-dimensional (2D) advection-diffusion-reaction equation of concentration movement in a pipe. Second, it presents the analytical solution of a one-dimensional (1D) advection-dispersion-reaction equation. Third, by using the numerical and analytical solutions, effective diffusion and longitudinal dispersion coefficients of chlorine and fluoride are calculated. At the end, simulation of part of a real network with the results reported in this study is presented.
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Data Availability Statement
Raw data (experimental reading) for this study are available from the corresponding author by request.
Acknowledgments
Financial support given for this study and preparation of this paper by the Scientific Research Projects (BAP) Commission of Gazi University is greatly acknowledged. The authors would also like to thank Mr. Berk Demircioglu for his sincere help during the process of calculating the dispersion coefficients reported in this study. The first numerical study for the search of a secondary flow (Dean vortices) in the test pipe bends was performed with the well-known modeling software ANSYS 2020 R1 Fluent licensed to the Mechanical Engineering Department of the Faculty of Engineering, Gazi University. The analysis was performed by Professor Dr. Oguz Turgut and his research assistant Emre Askin Elibol. The second numerical study was performed by Alper Ataseven from IOG Engineering Ltd. The authors would like to thank them for their sincere help in proving the reliability of the results presented in this paper.
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Published In
Journal of Water Resources Planning and Management
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 17, 2019
Accepted: Jan 22, 2021
Published online: May 13, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 13, 2021
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