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 - 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.  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.
|State||Published - 2020|
|Event||14th European Turbulence Conference, ETC 2013 - Lyon, France|
Duration: 1 Sep 2013 → 4 Sep 2013
|Conference||14th European Turbulence Conference, ETC 2013|
|Period||1/09/13 → 4/09/13|