Heavy particles in the near field of a turbulent jet

The behaviour of aluminium spherical particles of density ρp = 2700 Kg/m3 dispersed in a turbulent round water jet, at Reynolds number Re ≈ 15000 and exit Stokes number St0 = 0.013 is investigated via Particle Image Velocimetry up to x/D = 16 from the nozzle exit. Average and fluctuating velocity fields are analysed and compared to the unladen jet condition. Generally, particles are reported not to behave like tracers, in particular outside the region of the jet potential core. Velocity fluctuations are reported to differ from the fluid fluctuations in particular at the jet centreline and shear layers. In particular, axial velocity fluctuations appear to be dominated by the fluid phase whereas a tendency towards an increase of radial fluctuations downstream of the jet exit is reported for particles. The complexity of this scenario suggests a selective particle response with respect to the flow dynamics.