In experimental studies of the turbulent/ non-turbulent interface (TNTI) of wall-bounded flows, a significant challenge is accurate detection of the interface in 2D and 3D. Detection criteria based on turbulent kinetic energy (TKE) and homogeneity of the flowfield have been applied to PIV measurements of TBLs [2, 15]. The use of local seeding (LS) as a passive tracer was also investigated to decouple TNTI detection from the reduced spatial resolution associated with velocimetric methods. This yielded the simple and robust particle image density detection method, which has good spatial resolution but lacks access to velocimetry in the potential flow [15]. With recent development of fluorescent DEHS and its application to tag the TBL, it is possible to obtain the entire flowfield in addition to segregating the flow into its turbulent and non-turbulent parts in air flows [8,9,10]. Finally, 3D reconstruction of the TNTI with imaging of the TBL at an oblique angle opens the door to more complex investigation and new insights of the interface [14].     «

In experimental studies of the turbulent/ non-turbulent interface (TNTI) of wall-bounded flows, a significant challenge is accurate detection of the interface in 2D and 3D. Detection criteria based on turbulent kinetic energy (TKE) and homogeneity of the flowfield have been applied to PIV measurements of TBLs [2, 15]. The use of local seeding (LS) as a passive tracer was also investigated to decouple TNTI detection from the reduced spatial resolution associated with velocimetric methods. This yi...     »