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We inject with jet mixtures of ethanol and dissolved anise oil upward intoquiescent water with jet Reynolds numbers, 500<Re_0<810. Nucleation of oildroplets, also known as the ouzo effect, follows from the entrainment andmixing with ambient water, where the oil has much lower oil solubility than theinitial jet fluid. We experimentally investigate the local concentration duringsolvent exchange near the turbulent/non-turbulent interface (TNTI) in thequasi-2D turbulent jet. Using a light attenuation technique, we measure theconcentration fields for the nucleated oil droplets and the reference dye case.  Combining conventional and conditional profiles, we show that the nucleationof oil droplets is initiated near the TNTI, and penetrates into the turbulentregion as the jet travels downstream. Persistent nucleation not only sustainsthe scalar dissipation but also leads to enhanced temporal fluctuations of theconcentrations till the downstream position. The p.d.f.s of the concentrationexhibit pronounced bimodal shapes near the TNTI and positively-skewed curvestoward the centerline, suggesting that the oil droplets nucleate across thejet. We estimate the nucleation rate near the TNTI using a control volumeapproach. We also model the concentration field of the nucleated oil using thatof the passive scalar and the ternary phase diagram of a water, ethanol, andanise oil mixture.  This study extends our previous work on the mean field, revealing moredetails of the turbulent statistics induced by solvent exchange. The findingsshed new light on the interplay between mixing and nucleation in a quasi-2Dturbulent jet. We also provide the first modelling of solvent exchange inturbulent flows with a simple model based on ethanol concentration and thephase diagram.

Mixing and solvent exchange near the turbulent/non-turbulent interface in a quasi-2D jet