Experimental and Numerical Study on the Flow Field and Friction Factor in a Pressurized Corrugated Pipe
Publication: Journal of Hydraulic Engineering
Volume 141, Issue 11
Abstract
An experimental campaign including measurement of pressure drops and velocity profiles was conducted on the pressurized flow in a commercial corrugated pipe. The results show that the empirical graphs suggested by Morris in the fifties may produce inaccurate assessments of the friction factor, in particular, for low Reynolds numbers. The experimental data was then reproduced by means of a numerical model with the large eddy simulation (LES) technique. The friction factor behavior for low and relatively high Reynolds numbers was thus investigated. The numerical simulations were in good agreement with the experimental results, showing the LES suitability to predict the effect of the pipe wall corrugation on the mean flow in a range of Reynolds numbers typical of engineering applications. To provide a quantitative evaluation of the numerical model, the Nash–Sutcliffe model efficiency coefficient and the root mean square error (RMSE) were calculated, demonstrating the goodness of the numerical results. The LES model was also used to investigate the effect of the wall corrugation on the turbulence. Although the inner-layer was dramatically affected by the corrugation, a collapse of the mean velocity profile was evident in the outer-layer. In the wall region, the coherent pattern of the turbulent structures appeared to be quite disaggregated in the streamwise direction, even though they preserved the alternating arrangement of positive and negative values. Overall, both qualitative and quantitative analysis revealed that, for the range of investigated values, the streak and vortical structures were independent of the Reynolds number.
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Acknowledgments
The authors wish to thank System Group—Italiana Corrugati for providing the pipes used in the experimental set-up.
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Published In
Journal of Hydraulic Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 20, 2014
Accepted: Apr 6, 2015
Published online: Jun 9, 2015
Published in print: Nov 1, 2015
Discussion open until: Nov 9, 2015
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