Coherent contribution to turbulent mixing of a jet in cross flow

Abstract

Abstract. In this work, an experimental study of a jet issuing in cross flow is reported. Support is offered to a theory on the origin of Karman-like vortices, in the wake ofjets issuing in boundary layers. Further, a coherent structure with strong contribution to the energetics of the flow field is identified here. This structure has not been reported earlier, according to the present authors' knowledge, and it is shown to be related to engulfment of extemal fluid at the bottom of the jet, and to interesting stochastic and spectral characteristics of the flow field. Three-dimensional plots of the coherent quantities, based on experimental data, reveal a double-helical morphology of the coherent structure. The same morphology has recently been proposed for the far field of jets issuing in stagnant fluid (i.e., without cross flow). The results of this study are expected to support theoretical and numerical work on jets issuing in cross flow.

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“…The experimental study of turbulent mixing requires the measurement of the concentration signal at various positions in a flow field. Statistical analysis of the concentration signal provides information about various mixing characteristics like the length scale of mass eddies, mixing mechanisms and mixing time [1][2][3][4][5][6]. The concentration signal at a position allows the computation of the intensity of segregation, first introduced by Danckwerts [7], which is a quantitative measure of the degree of mixing.…”