The Hydraulic Jump as a Well Jet

An attempt to study the mechanics of the hydraulic jump, treating it as a plane turbulent wall jet under adverse pressure gradient, is presented. Extensive measurements have been made regarding the pressure field, velocity distribution, and the boundary shear stress in the jump for nine supercritical Froude numbers from 2.68 to 9.78. It has been found that the pressure distribution is hydrostatic only in a narrow region near the bed. The velocity distribution in the forward flow is similar. The skin friction coefficient based on the supercritical velocity decreases monotonically with x/y2, in which x is the distance from the beginning of the jump and y2 is the subcritical sequent depth. A more accurate form of the momentum equation for the jump has been developed. Also, a method has been devised to predict the surface and energy profile in the jump.