The cold flow riser setup mainly consists of a 8.8m high plexiglass tube with an internal diameter of 0.10 m, a 4m high fluidized bed storage tank for the particles, and a 2m long aerated standpipe/solids inlet line with an internal diameter of 0.08m. The solid particles used up-to-date are Fluid Catalytic Cracking (FCC) particles, with a mean volume averaged diameter of 77 μm and a solid density of 1550 kg m⁻³. Two high efficiency glass cyclones guarantee a good recuperation of solids from the air flow. The experimental setup is equipped with a two-probe LDA that allows performing coincident three-component solids velocity measurements in the gas-solid two-phase riser flow. The velocity  information comes from laser light scattered by the particles carried in the fluid as they move through the measurement volume. To distinguish between tracers and conventional particles and hence extract information on the velocity fields of each phase separately, an upgrade of the LDA to a PDA is planned.