Evolution of the turbulent/non-turbulent interface of an axisymmetric turbulent jet

Abstract

Measurements of a turbulent round air jet, using particle image velocimetry, were made to investigate the dynamics and transport processes at the continuous bounding interface between the turbulent and non-turbulent regions (T/NT) of the jet flow. The Reynolds number of the jet was in the range Red = 3,000-6,500 based on jet diameter with measurements taken between 0 and 40 jet diameters from the jet nozzle exit, which covers the developing and self-similar region of the jet. A velocity thresholding technique was used to define the T/NT interface. The results based on this methodology were found to agree well with previously published results (Westerweel et al. in Phys Rev Lett 95:174501, 20..