Turbulence over arrays of obstacles in low temperature helium gas |
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Authors: | H. Willaime J. Maurer F. Moisy P. Tabeling |
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Affiliation: | (1) Laboratoire de Physique Statistique, école Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France, FR |
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Abstract: | Turbulence produced in low temperature helium gas flowing over arrays of rectangular- and triangular-shaped blunt obstacles is investigated experimentally. The set-up allows both low fluctuation rates (down to 8%), and high microscale Reynolds numbers, (up to 1 150). The forced Kolmogorov equation is found to apply accurately. Similar to another flow configuration (counter rotating flow case [1]), the analysis of the flatness factor evolution with the Reynolds number reveals a transitional behavior around 650. Received 26 August 1999 and Received in final form 28 August 2000 |
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Keywords: | PACS. 47.27.Gs Isotropic turbulence homogeneous turbulence - 47.27.Jv High-Reynolds-number turbulence |
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