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Wall friction and velocity measurements in a double-frequency pulsating turbulent flow

Published online by Cambridge University Press:  08 January 2016

L. R. Joel Sundstrom ,
Berhanu G. Mulu  and
Michel J. Cervantes
L. R. Joel Sundstrom*
Affiliation:
Division of Fluid and Experimental Mechanics, Luleå University of Technology, SE-971 87, Luleå, Sweden
Berhanu G. Mulu
Affiliation:
Vattenfall Research and Development, SE-814 70, Älvkarleby, Sweden
Michel J. Cervantes
Affiliation:
Division of Fluid and Experimental Mechanics, Luleå University of Technology, SE-971 87, Luleå, Sweden Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway
*
†Email address for correspondence: joel.sundstrom@ltu.se
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Abstract

Wall shear stress measurements employing a hot-film sensor along with laser Doppler velocimetry measurements of the axial and tangential velocity and turbulence profiles in a pulsating turbulent pipe flow are presented. Time-mean and phase-averaged results are derived from measurements performed at pulsation frequencies ${\it\omega}^{+}={\it\omega}{\it\nu}/\bar{u}_{{\it\tau}}^{2}$ over the range of 0.003–0.03, covering the low-frequency, intermediate and quasi-laminar regimes. In addition to the base case of a single pulsation imposed on the mean flow, the study also investigates the flow response when two pulsations are superimposed simultaneously. The measurements from the base case show that, when the pulsation belongs to the quasi-laminar regime, the oscillating flow tends towards a laminar state in which the velocity approaches the purely viscous Stokes solution with a low level of turbulence. For ${\it\omega}^{+}<0.006$, the oscillating flow is turbulent and exhibits a region with a logarithmic velocity distribution and a collapse of the turbulence intensities, similar to the time-averaged counterparts. In the low-frequency regime, the oscillating wall shear stress is shown to be directly proportional to the Stokes length normalized in wall units $l_{s}^{+}~(=\sqrt{2/{\it\omega}^{+}})$, as predicted by quasi-steady theory. The base case measurements are used as a reference when evaluating the data from the double-frequency case and the oscillating quantities are shown to be close to superpositions from the base case. The previously established view that the time-averaged quantities are unaffected by the imposition of small-amplitude pulsed unsteadiness is shown to hold also when two pulsations are superposed on the mean flow.

JFM classification

Boundary Layers: Pipe flow boundary layer Turbulent Flows: Shear layer turbulence Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 788 , 10 February 2016 , pp. 521 - 548
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Copyright
© 2016 Cambridge University Press 

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