In case you missed it, these videos were posted on Frostytech's Facebook page a couple days ago. Fantastically informative 1960's era university level films on visualizing Fluid Mechanics properties such as constrained flow, boundary layers, turbulent & laminar flow, pressure, etc. We hope you find them interesting, they illuminate many of the fundamental laws of physics which come into play with forced air cooled heatsinks.
[FB] via [Frostytech.com]