DOI: 10.1615/TSFP4
LDV MEASUREMENTS IN A RECTANGULAR SURFACE JET
ABSTRAKT
The flow field for a non-buoyant rectangular surface jet was studied using Laser Induced Fluorescence and Laser Doppler Velocimetry. Laminar and turbulent regimes were considered. After an initial development, the jet reached a self-similar state. While the horizontal profiles of the stream-wise velocity were similar to those observed in free jets, the vertical distributions were distinctly flat. In agreement with previous studies, the development of a thin surface current, whose lateral growth rate was twice the lateral growth rate of the bulk of the jet, was observed. The surface current formed as a result of turbulence anisotropy imposed by the surface boundary. Unlike the bulk of the jet below the surface, surface current entrained little ambient fluid and mostly spread radially.