Experimental study of the von Kármán flow from Re = 102 to 106: spontaneous symmetry breaking and turbulent bifurcations
Spontaneous symmetry breaking and bifurcations can be observed in highly turbulent flows. Such phenomena are particularly interesting because they may be considered as laboratory models for changes of states in far-fromequilibrium complex and/or large natural systems. The von Kármán flow is a closed swirling shear flow produced by two counterrotating impellers in a cylindrical vessel which allows to easily access high Reynolds numbers Re up to 106. In this study, we have used water-glycerol mixtures to scan a wide range of Re from 102 to 106. Using stereoscopic PIV, we have been able to measure the three components of the velocity field in a meridian plane of the flow. Our acquisition frequency is moderate, around 10 Hz, but our system is able to record up to 32 000 velocity fields providing a large statistics and highly converged averages.
KeywordsReynolds Number Shear Layer High Reynolds Number Meridian Plane Reynolds Number Range
Unable to display preview. Download preview PDF.