On the Reynolds number dependence of a plane two-dimensional wall jet

Paper in proceeding, 1994

Measurements in a plane two-dimensional turbulent wall-jet has been conducted at different slot Reynolds numbers using hot-wire technique. The wall-jet was shown to be two-dimensional and self preserving. Using momentum scaling, based on viscosity and inlet momentum flux, the growth of the half-width and the decay of the maximum mean velocity were showed to be independent of the slot Reynolds number. It was also found that as compared to an ordinary wall boundary layer, the strong interactions between the inner and outer regions limited the extension of the logarithmic part of the mean velocity profile, and enhanced the turbulence level close to the wall.