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This is a report on implementation of the next stage of a project motivated by the discovery of far more important role played by the sub-Kolmogorov scales than commonly believed in high Reynolds number turbulence such as manifestations of nonlocal nature of turbulence involving direct and bidirectional coupling of conventionally-defined inertial and dissipative ranges showing (a) that both concepts are ill-posed and (b) that further progress requires sub-Kolmogorov resolution. The main results and issues that prompted the present work are in [1]–[2] and references therein. The final goal is manufacturing a multi-sensor probe of much smaller scale than available today with access to quantities like vorticity and strain at sub-Kolmogorov scales in high- Reynolds-number flows such as performed by Gulitski et al. [3] in the atmospheric surface layer at Reλ~104. This requires manufacturing a single-sensor probe of length of the order ~50 μ or even smaller to be used as a building block for the above multi- sensor one. The main theme of the present report is performing a number of experiments with single-sensor micro-probes of different lengths in a laboratory jet flow and comparison of experimental results obtained with such probes and the conventional hot-wire probe.
Author(s):
Youry Borisenkov
Tel-Aviv University
Israel
Michael Kholmyansky
Tel-Aviv University
Israel
Slava Krylov
Tel-Aviv University
Israel
Alexander Liberzon
Tel-Aviv University
Israel
Arkady Tsinober
Tel-Aviv University
Israel