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research-article

Wall Pressure in Developing Turbulent Pipe Flows

[+] Author and Article Information
Kamal Selvam

Laboratoire Ondes et Milieux Complexes, CNRS & Université Le Havre Normandie, Le Havre 76600, France
kamalbowselvam@gmail.com

Emir Öngüner

Department of Aerodynamic, and Fluid Mechanics, BTU Cottbus-Senftenberg, Cottbus 03046, Germany
emir.oenguener@tu-cottbus.de

Jorge Peixinho

Laboratoire Ondes et Milieux Complexes, CNRS & Université Le Havre Normandie, Le Havre 76600, France
jorge.peixinho@univ-lehavre.fr

El-Sayed Zanoun

Department of Aerodynamics and Fluid Mechanics, BTU Cottbus-Senftenber, Cottbus 03046, Germany; Benha Faculty of Engineering, Benha University, Benha 13512, Egypt
elsayed.zanoun@aol.com

Christoph Egbers

Department of Aerodynamics and Fluid Mechanics, BTU Cottbus-Senftenberg, Cottbus 03046, Germany
christoph.egbers@b-tu.de

1Corresponding author.

ASME doi:10.1115/1.4039294 History: Received August 21, 2017; Revised December 15, 2017

Abstract

Velocity fluctuations are widely used to identify the behavior of developing turbulent flows. The pressure on the other hand, which is strongly coupled with the gradient of the mean velocity and fluctuations, is less explored. In this study, we report the results of an experimental study for the development of pipe flow at high Reynolds numbers, where the wall pressure fluctuations are measured along the axial direction. It is found that the pressure fluctuations increase exponentially along the pipe with a self-similarity scaling. The exponential growth of the pressure fluctuations along the pipe saturates after reaching a critical position. It qualitatively agrees with the critical position for fully developed turbulence, which was obtained from earlier velocity fluctuations at various locations along the pipe centerline. Additional tuft visualizations have been carried out near the pipe wall, reaffirming that fluctuations increase as the flow moves downstream along the pipe. Results also show that the exponential growth of the pressure fluctuations is robust to different sizes of ring obstacles placed close to the pipe inlet. Finally, it is found that the pressure fluctuations decrease as a function of Reynolds number, contrary to the boundary layer flow.

Copyright (c) 2018 by ASME
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