Scaling laws and intermittency in cryogenic turbulence using SHREK experiment

International audienceA fundamental study of normal helium turbulence (He-I) in von Kármán swirling flow generated with the help of one and only unique size facility called Superfluid High REynolds von Kármán experiment (SHREK) available at CEA-Grenoble is presented here. This study comprises of measurements of instantaneous velocity using the hot wire anemometry technique for three different configurations of the flow such as co-rotation, clockwise counter rotation (hereafter called contra rotation) and counterclockwise counter rotation (hereafter called anti-contra rotation). The maximum Taylor's Reynolds Number, Re λ for these measurements found to be up to 10000. A discussion on the aspect of intermittency is presented for the largest dataset available with the samples O(10 9). The probability density functions (PDF's) of the velocity increments are discussed with its skewness and flatness along with the exponents of structure function up to certain order. These effects of various quantities of turbulence such as scales of turbulence, dissipation and Re λ with respect to applied forcing is discussed. The scalings laws already established for classical turbulence are explored based on the present experimental data in cryo-genic turbulence