Free Surface Impinging Jet

Conclusions•Analytically, the stagnation region of axisymmetric jets issolved as a special case of the Falkner-Skan similarityanalysis. It is dropping the y-momentum term in Navier-Stokes equation, and converting the x-momentum term fromthe parabolic PDE to become ODE. However, in the jetimpingement flow, as the flow approach the stagnation zone,it will be decelerated in axial direction and accelerated inradial direction simultaneously. The region of changing flowdirection, especially near the nozzle edge, the flow direction isnot pre-dominantly in radial direction. Hence, the completemathematical analysis should not neglect the y-momentumequation. As can be shown from the CFD Volume of Fluidnumerical simulation, at the region about r/D ≈ 0.5 and z/D >0.04, the local axial velocity relative to resultant velocity isgreater than 0.1. This imply that the axial velocity component(y momentum equation) cannot be neglected