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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

DIRECT QUANTITATIVE MEASUREMENT OF THE LIFE TIME OF LOCALIZED TURBULENCE IN PIPE FLOW

pages 132-137
DOI: 10.1615/TSFP6.210
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摘要

In pipe flow at low Reynolds number, decay of localized turbulent structures is observed. As the Reynolds number is increased, the question emerges whether the life time of these structures diverges at a finite Reynolds number or remains transient. In the current investigation we determine the life time of localized structures quantitatively from pressure measurements, while in previous investigations the distance over which a structure survived has been determined. The obtained results confirm that the life time of localized turbulent structures does not diverge for this Reynolds number regime.

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