Wall Shear Stress in the Early Stage of Unsteady Turbulent Pipe Flow
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Hydraulic Engineering
Volume 137, Issue 5
Abstract
Conventionally, wall shear stress in an unsteady turbulent pipe flow is decomposed into a quasi-steady component and an “unsteady wall shear stress” component. Whereas the former is evaluated by using “standard” steady flow correlations, extensive research has been carried out to develop methods to predict the latter leading to various unsteady friction models. A different approach of decomposition is used in the present paper whereby the wall shear in an unsteady flow is split into the initial steady value and perturbations from it. It is shown that in the early stages of an unsteady turbulent pipe flow, these perturbations are well described by a laminar-flow formulation. This allows simple expressions to be derived for unsteady friction predictions, which are in good agreement with experimental and computational results.
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Acknowledgments
The authors gratefully acknowledge that the work reported in this paper has been stimulated by research sponsored through EC-HYDRALAB III contract UNSPECIFIED022441 (R113) and the UK Engineering and Physical Sciences Research Council (EPSRC) through grants EPSRC-GBEP/C015177/1 and EPSRC-GBEP/C015479/1.
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Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 5 • May 2011
Pages: 606 - 610
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 6, 2010
Accepted: Oct 5, 2010
Published online: Nov 24, 2010
Published in print: May 1, 2011
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