Four times the speed, still 19.47 degrees — where water depth blows the Kelvin wedge open to 90
·8 min read
The Kelvin half-angle in deep water stays at 19.47° even if speed quadruples. A shallow bottom opens it toward 90° once the depth Froude number reaches 1.
The Shock Wave in Your Kitchen Sink — Froude Number and the Hydraulic Jump
·7 min read
At Fr 2.86 a 0.2 m supercritical sheet jumps to Fr 0.42 and a depth of 0.714 m, scattering 0.238 m of specific energy into the roller.