Abstract
The near flow field of an axisymmetric jet is investigated using laser induced fluorescence (LIF), laser doppler anemometry (LDA), and particle tracking velocimetry (PTV). Primary and secondary instabilities are detected on a longitudinal plane and on cross-sections. The attention is focused onto the effects of rigid or free boundaries sideways to the nozzle outlet, on the start up, growth, and interaction of large vortical structures. On an average, higher ambient fluid entrainment is detected in free-slip rather than in no-slip conditions. The quality and the significance of the results are strengthened by the fact that they are derived using different methods. The connection between primary instabilities is observed in longitudinal sections and secondary instabilities observed in cross-sections. Some of the differences between the two boundary conditions decrease with Reynolds number and the measurements concern with the near field.
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