Particle image velocimetry (PIV) is used to determine the effect of particle concentration on the fluid phase of a solid-liquid multiphase impinging jet. Two spherical particles were considered, polystyrene of 1050 kg m-3 and glass of 2450 kg m-3, both with a diameter of 225 μm. The fluid axial and radial velocities are measured with particle volume fractions (φ) equal to 0, 1x10-4, 2x10-4 and 4x10-4.For both particle types as the concentration is increased, the level of axial velocity retained immediately prior to impingement (at 6 diameters from the pipe exit) also increases. At low particle concentrations the particles have little effect on the flow turbulence, however, at higher particle concentrations the particle effect becomes more significant, with a near doubling of the peak axial RMS velocity one diameter from the jet outlet in one case. The introduction of polystyrene particles has the effect of dampening radial and axial RMS velocities, except for at the highest concentration immediately after the jet outlet where the axial turbulence is enhanced by the particles
