  This fluid dynamics video is an entry for the Gallery of Fluid Motion of the
66th Annual Meeting of the APS-DFD. In this video, the scalar transfer across
the turbulent/non-turbulent (T/NT) interface in a planar jet is investigated by
using a direct numerical simulation. Visualization of the scalar flux across
the T/NT interface shows that the diffusive species premixed in the ambient
flow is transferred into the turbulent region mainly across the leading edge
(Here, the leading edge is the T/NT interface across which the turbulent fluid
turns into the non-turbulent fluid in the streamwise direction).
