The effect of boundary-layer turbulence on mixing in heated jets

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The mixing properties of a heated axisymmetric jet at a density ratio of 0.55 were examined for initially laminar and turbulent separated boundary layers. Initially laminar jets displayed large intermittent spread rates with half-angles up to 45° and a corresponding rapid decay of the streamwise velocity and temperature on the jet axis. When the boundary layer was disturbed upstream of the nozzle exit, creating an initially turbulent separated layer, the jet mixing was significantly reduced. Flow visualization revealed that the turbulent conditions eliminated the intermittent nature of the jet spreading, producing constant spreading rates at half-angles near 10°.

Original languageEnglish (US)
Pages (from-to)865-868
Number of pages4
JournalPhysics of Fluids A
Issue number5
StatePublished - Jan 1 1992


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