Near-field of coaxial jets with large density differences

The paper describes an experimental investigation of coaxial jets with large density differences. Measurements by various techniques show that density effects on the flow dynamics are taken into account to first order by considering the specific outer to inner jet momentum flux ratio M and not separ...

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Bibliographic Details
Published in:Experiments in fluids 1999, Vol.26 (1-2), p.97-106
Main Authors: FAVRE-MARINET, M, CAMANO, E. B, SARBOCH, J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Jets
Physics
Turbulent flows, convection, and heat transfer
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Summary:The paper describes an experimental investigation of coaxial jets with large density differences. Measurements by various techniques show that density effects on the flow dynamics are taken into account to first order by considering the specific outer to inner jet momentum flux ratio M and not separately the density and velocity ratios. A regime of recirculation occurs for M higher than a critical value (M(c) approximately equal to 50). For a given value of M, however, the position of the recirculation bubble is slightly shifted in the upstream direction for density ratios much smaller than one. An unexpected result is obtained for an extremely low density ratio: the onset of recirculation occurs for a significantly higher value of M (M(c) in the range 100-140) for helium/SF6 jets (density ratio: 0.028). (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/s003480050268