Organized by textbook: https://learncheme.com/
Example problem that demonstrates the use of boundary layers and boundary layer thickness as well as flow regime (laminar or turbulent) to define the entry length section. Made by faculty at the University of Colorado Boulder, Department of Chemical and Biological Engineering.
Check out the Fluid Mechanics playlist here:
http://www.youtube.com/playlist?list=PL324604EAA66EA2F2
