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Fully developed periodic turbulent pipe flow. Part 2. The detailed structure of the flow

Published online by Cambridge University Press:  20 April 2006

B. R. Ramaprian  and
S. W. Tu
B. R. Ramaprian
Affiliation:
Iowa Institute of Hydraulic Research, The University of Iowa
S. W. Tu
Affiliation:
Bechtel Civil and Mineral Inc., San Francisco, California
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Abstract

The main experimental results of the study of periodic turbulent pipe flow have been described in Part 1 of this report. In this second part, these experimental data are examined in greater detail to understand the effect of imposed oscillation on the flow structure, at moderate to large oscillation frequencies. Data on phase and amplitude and energy spectrum are used to study the effect of the imposed oscillation on the turbulence structure at these interactive frequencies of oscillation. Additional experiments which were performed to study the effect of oscillation frequency on the flow structure are also reported. Based on the present observations as well as on the data from other sources, it is inferred that turbulent shear flows respond very differently from laminar shear flows to imposed unsteadiness. A turbulent Stokes number relevant for characterizing the unsteady turbulent shear flows is identified and used to classify such flows.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 137 , December 1983 , pp. 59 - 81
Copyright
© 1983 Cambridge University Press

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