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Near-wall statistics of a turbulent pipe flow at shear Reynolds numbers up to 40 000

Published online by Cambridge University Press:  15 August 2017

Christian E. Willert*
Affiliation:
DLR Institute of Propulsion Technology, 51170 Köln, Germany
Julio Soria
Affiliation:
LTRAC, Department of Mechanical and Aerospace Engineering, Monash University, Clayton Campus, Melbourne, VIC 3800, Australia Department of Aeronautical Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Michel Stanislas
Affiliation:
LML, Ecole Centrale de Lille, France
Joachim Klinner
Affiliation:
DLR Institute of Propulsion Technology, 51170 Köln, Germany
Omid Amili
Affiliation:
LTRAC, Department of Mechanical and Aerospace Engineering, Monash University, Clayton Campus, Melbourne, VIC 3800, Australia Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN, USA
Michael Eisfelder
Affiliation:
LTRAC, Department of Mechanical and Aerospace Engineering, Monash University, Clayton Campus, Melbourne, VIC 3800, Australia
Christophe Cuvier
Affiliation:
LML, Ecole Centrale de Lille, France
Gabriele Bellani
Affiliation:
CIRI Aeronautics, University of Bologna, Italy
Tommaso Fiorini
Affiliation:
CIRI Aeronautics, University of Bologna, Italy
Alessandro Talamelli
Affiliation:
CIRI Aeronautics, University of Bologna, Italy
*
Email address for correspondence: [email protected]

Abstract

This paper reports on near-wall two-component–two-dimensional (2C–2D) particle image velocimetry (PIV) measurements of a turbulent pipe flow at shear Reynolds numbers up to $Re_{\unicode[STIX]{x1D70F}}=40\,000$ acquired in the CICLoPE facility of the University of Bologna. The 111.5 m long pipe of 900 mm diameter offers a well-established turbulent flow with viscous length scales ranging from $85~\unicode[STIX]{x03BC}\text{m}$ at $Re_{\unicode[STIX]{x1D70F}}=5000$ down to $11~\unicode[STIX]{x03BC}\text{m}$ at $Re_{\unicode[STIX]{x1D70F}}=40\,000$. These length scales can be resolved with a high-speed PIV camera at image magnification near unity. Statistically converged velocity profiles were determined using multiple sequences of up to 70 000 PIV recordings acquired at sampling rates of 100 Hz up to 10 kHz. Analysis of the velocity statistics shows a well-resolved inner peak of the streamwise velocity fluctuations that grows with increasing Reynolds number and an outer peak that develops and moves away from the inner peak with increasing Reynolds number.

Type
Rapids
Copyright
© 2017 Cambridge University Press 

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