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This fluid dynamics video is an entry for the Gallery of Fluid Motion of the66th Annual Meeting of the APS-DFD. In this video, the scalar transfer acrossthe turbulent/non-turbulent (T/NT) interface in a planar jet is investigated byusing a direct numerical simulation. Visualization of the scalar flux acrossthe T/NT interface shows that the diffusive species premixed in the ambientflow is transferred into the turbulent region mainly across the leading edge(Here, the leading edge is the T/NT interface across which the turbulent fluidturns into the non-turbulent fluid in the streamwise direction).

Scalar Transfer across a Turbulent/non-turbulent Interface in a Planar Jet