Westerweel, J; Pedersen, JM; Fukushima, C; Hunt, JCR; (2005) Mechanics of the turbulent/non-turbulent interface of a jet. Physical Review Letters , 95 (17) , Article 174501. 10.1103/PhysRevLett.95.174501.

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Abstract

We report the results of an experimental investigation of the mechanics and transport processes at the bounding interface between the turbulent and nonturbulent regions of flow in a turbulent jet, which shows the existence of a finite jump in the tangential velocity at the interface. This is associated with small-scale eddying motion at the outward propagating interface (nibbling) by which irrotational fluid becomes turbulent, and this implies that large-scale engulfment is not the dominant entrainment process. Interpretation of the jump as a singular structure yields an essential and significant contribution to the mean shear in the jet mixing region. Finally, our observations provide a justification for Prandtl’s original hypothesis of a constant eddy viscosity in the nonturbulent outer jet region.

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