“…It is noticed that the vorticity thickness grows approximately linearly with x until about 0.2 m from the splitter plate. It is noted that the vorticity thickness is different from the visual thickness of the shear layer observed previously from smoke traces and schlieren photographs (Butuk and Gollahalli, 1995). In Brown and Roshko study (1974) the vorticity thickness was approximately half of the visual thickness at a given location.…”