Wall Stress Distribution Due To Jet Impingement

The problem of normal impingement of a laminar axisymmetric jet with a flat exit velocity profile is studied by solving the NavierStokes equations numerically. The distributions of the shear stress and pressure on the target plane are obtained for several values of Reynolds number Re and tube height above the target plane. Boundary conditions at farfield are applied at a finite radial location to match an exact farfield solution. It is observed that the peak value of the nondimensional wall shear stress occurs at a radial location on the wall beyond one tube radius, and decreases with an increase in Re. The nondimensional wall shear stress is not very sensitive to the height of the tube exit above the target plane, except at lower values of Re. The distributions of the nondimensional pressure and the radial pressure gradient are not very sensitive to the height of the tube above the target plane.