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Experimental investigation of laminar turbulent intermittency in pipe flow

Published online by Cambridge University Press:  02 June 2011

DEVRANJAN SAMANTA ,
ALBERTO DE LOZAR  and
BJÖRN HOF
DEVRANJAN SAMANTA*
Affiliation:
Max Plank Institute for Dynamics and Self-Organisation, Bunsenstrasse 10, Göttingen 37073, Germany
ALBERTO DE LOZAR
Affiliation:
Max Plank Institute for Dynamics and Self-Organisation, Bunsenstrasse 10, Göttingen 37073, Germany
BJÖRN HOF
Affiliation:
Max Plank Institute for Dynamics and Self-Organisation, Bunsenstrasse 10, Göttingen 37073, Germany
*
†Email address for correspondence: devranjansamanta@gmail.com
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Abstract

In shear flows, turbulence first occurs in the form of localized structures (puffs/spots) surrounded by laminar fluid. We here investigate such spatially intermittent flows in a pipe experiment showing that turbulent puffs have a well-defined interaction distance, which sets their minimum spacing as well as the maximum observable turbulent fraction. Two methodologies are employed. Starting from a laminar flow, puffs are first created by locally injecting a jet of fluid through the pipe wall. When the perturbation is applied periodically at low frequencies, as expected, a regular sequence of puffs is observed where the puff spacing is given by the ratio of the mean flow speed to the perturbation frequency. At large frequencies however puffs are found to interact and annihilate each other. Varying the perturbation frequency, an interaction distance is determined which sets the highest possible turbulence fraction. This enables us to establish an upper bound for the friction factor in the transitional regime, which provides a well-defined link between the Blasius and the Hagen-Poiseuille friction laws. In the second set of experiments, the Reynolds number is reduced suddenly from fully turbulent to the intermittent regime. The resulting flow reorganizes itself to a sequence of constant size puffs which, unlike in Couette and Taylor–Couette flow are randomly spaced. The minimum distance between the turbulent patches is identical to the puff interaction length. The puff interaction length is found to be in agreement with the wavelength of regular stripe and spiral patterns in plane Couette and Taylor–Couette flow.

JFM classification

Instability: Transition to turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 681 , 25 August 2011 , pp. 193 - 204
Copyright
Copyright © Cambridge University Press 2011

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References

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Samanta et al. supplementary movie

The movie shows the reduction experiment. Initially the flow is fully turbulent at Re= 4500. Then a bypass valve in a parallel pipe is opened to reduce the flow to Re= 2200 (marked by the disappearance of the white spot). After a brief period of decaying turbulence, the flow at Re= 2200 is intermittent showing the coexistence of laminar flow and turbulent puffs.

Download Samanta et al. supplementary movie(Video)
Video 9.4 MB

Samanta et al. supplementary movie

The movie shows the reduction experiment. Initially the flow is fully turbulent at Re= 4500. Then a bypass valve in a parallel pipe is opened to reduce the flow to Re= 2200 (marked by the disappearance of the white spot). After a brief period of decaying turbulence, the flow at Re= 2200 is intermittent showing the coexistence of laminar flow and turbulent puffs.

Download Samanta et al. supplementary movie(Video)
Video 9 MB