Abstract
The near field of helium-air jets exhausting into an air environment has been experimentally investigated using an aspiration probe and flow visualization. Jets with varying density ratios and Reynolds numbers were studied. Pure helium jets with density ratios of 0.14 were found to display a self-excited behavior characterized by intense mixing. The centerline concentration decay was found to be substantially increased for the self-excited jet. Flow visualization revealed the expulsion of side jets from the potential core region of low density jets. Radial profiles of concentration provide additional evidence that side-jets produce vigorous mixing.
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Richards, C.D., Breuel, B.D., Clark, R.P. et al. Concentration measurements in a self-excited jet. Experiments in Fluids 21, 103–109 (1996). https://doi.org/10.1007/BF00193913
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DOI: https://doi.org/10.1007/BF00193913