https://doi.org/10.1007/s100510070069
Turbulence over arrays of obstacles in low temperature helium gas
Laboratoire de Physique Statistique, École Normale
Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
Received:
26
August
1999
Revised:
28
August
2000
Published online: 15 November 2000
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.
PACS: 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.27.Jv – High-Reynolds-number turbulence
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
