Intermittency in a turbulent low temperature gaseous helium jet

Issue		Eur. Phys. J. B Volume 17, Number 2, September 2000


Page(s)		309 - 317
DOI		http://dx.doi.org/10.1007/s100510070146

Eur. Phys. J. B 17, 309-317

Intermittency in a turbulent low temperature gaseous helium jet

O. Chanal - B. Chabaud - B. Castaing - B. Hébral

Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042 Grenoble Cedex 9, France
bcastain@ens-lyon.fr

Received 13 October 1999 and Received in final form 19 May 2000

Abstract
We analyse experimental velocity measurements on the axis of a low temperature gaseous helium jet. From independent increments arguments, we reproduce the behaviour of structure functions. We show where this approach fails and how the intermittency phenomenon is a small correction. The physical arguments under the multiplicative cascade models for this intermittency imply an acceleration of this cascade close to the dissipative range, which we are able to evidence. This acceleration could be responsible of the apparent Extended Self Similarity between structure functions of various orders.

PACS
47.27.Wg Jets - 47.27.Gs Isotropic turbulence; homogeneous turbulence - 47.27.Jv High-Reynolds-number turbulence - 05.10.Gg Stochastic analysis methods (Fokker-Planck, Langevin, etc.)

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