Turbulence Driven Between Counter-rotating Disks in Low Temperature Helium Gas
We present an experimental study of fully developed turbulence between two counter-rotating disks, in low temperature helium gas. In this system, using low temperature helium gas allows to cover a range of microscale Reynolds number Rλ extending from 150 to 5040, under well controlled conditions. It is thus possible to investigate which would be difficult to address by using ordinary fluids. We give two examples: [i] the evolution of the structure function exponent and [ii] that of the hyperflatess of the velocity derivatives, with the Reynolds number. Unexpected results have been found; in particular, the existence of a transition in the dissipative range, around Rλ ≈ 700.
KeywordsConvection Helium Vorticity Resis
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