Simultaneous measurement of temperature and velocity
was conducted using laser-induced fluorescence and particle image velocimetry.
The following animation shows the velocity and temperature fields on a symmetry plane
in the stagnation region of a plane impinging jet. Counter-rotating vortex pairs,
which appear near the wall, sweep the thermal boundary layer and eject heated fluid,
shown in red. This work was performed at Keio University in 1992.
The video below shows the raw fluorescence image together with the simultaneously recorded particle image for PIV. I was truly impressed when I first saw this footage.
