Abstract
This study used three-dimensional particle tracking velocimetry (3D-PTV) to measure the water jet flow inside two parallel flat plates. The gap in the walls 2h was 4mm, the nozzle height D was 4mm, and the jet Reynolds number was varied from Re=1150 to 3840. The velocity profile of z=0 had top-hat profile at the nozzle exit and the profile agreed with theoretical solution of two-dimensional free jet by Goertler in the lower reaches of stream. The growth rate of the jet width was approximately db/dx=0.08, which is slightly lower than the value of planar free jet of 0.1. The velocity profile of y=0 became similar to the profile of turbulent channel flow in accordance with reaching downstream. The downstream evolution of UCL exhibited more decay than planar jet and The RMS u'_<CL> was lower than that of planer jet. Streamwise decay of momentum was consistent with a theory involving friction factor of approximately C_f=0.015.
