Effect of Background Turbulence on Passive Scalar Mixing Within a Turbulent Jet

Abstract eng:
Despite the fact that most jets (natural or man-made) discharge into turbulent environments, the vast majority of previous studies of turbulent jets have considered the emission of jets into quiescent or laminar surroundings. The present investigation builds on the work of Khorsandi et al. [1], who studied the velocity field of a turbulent jet emitted into a turbulent background. We examine herein the effect of an approximately homogeneous, isotropic, zero-mean-flow turbulent background on the scalar field of a turbulent jet. To this end, we measured the concentrations of a high-Schmidt-number passive scalar within the jet by means of planar laser-induced fluorescence. We present the statistics of the jet’s scalar field and compare them with the results of a jet emitted into a quiescent ambient.

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