Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/997
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Type: Journal article
Title: Developments in unsteady pipe flow friction modelling
Author: Bergant, A.
Simpson, A.
Vitkovsky, J.
Citation: Journal of Hydraulic Research, 2001; 39(3):249-257
Publisher: International Association for Hydro-Environment Engineering and Research
Issue Date: 2001
ISSN: 0022-1686
1814-2079
Statement of
Responsibility: 
Anton Bergant, Angus Ross Simpson, John Vìtkovsky
Abstract: This paper reviews a number of unsteady friction models for transient pipe flow. Two distinct unsteady friction models, the Zielke and the Brunone models, are investigated in detail. The Zielke model, originally developed for transient laminar flow, has been selected to verify its effectiveness for "low Reynolds number" transient turbulent flow. The Brunone model combines local inertia and wall friction unsteadiness. This model is verified using the Vardy's analytically deduced shear decay coefficient C* to predict the Brunone's friction coefficient k rather than use the traditional trial and error method for estimating k. The two unsteady friction models have been incorporated into the method of characteristics water hammer algorithm. Numerical results from the quasi-steady friction model and the Zielke and the Brunone unsteady friction models are compared with results of laboratory measurements for water hammer cases with laminar and low Reynolds number turbulent flows. Conclusions about the range of validity for the three friction models are drawn. In addition, the convergence and stability of these models are addressed.
Rights: © International Association Of Hydraulic Engineering and Research
RMID: 0020010208
DOI: 10.1080/00221680109499828
Appears in Collections:Civil and Environmental Engineering publications
Environment Institute publications

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