Experimental rrsearch and computer simulation of gas-solid two-phase flow in a riser

A multi-dimensional two phase model was used to compute gas solid flow in a CFB. The conservation equations for both solid and gas were solved directly. The constitutive relations for solid phase were derived from kinetic theory of granular flow. Local solid concentration and solid flux were measured by means of a 7-ray densitometer and non-isokinetic extraction probe, respectively. Power spectrum density of solid concentration was calculated using FFT method. The model predicts the most important aspects of a riser, including phase velocities and concentration distribution throughout a riser. The simulations show agreement well with experimental results.