Turbulent two-phase flow calculations were performed with a commercial CFD computer code referred to as FLOW3D to determine how well its predictions compare to available experimental data. Predicted results obtained for pressure drop and velocity variations in fully developed vertical upflows in circular pipes are in good qualitative agreement and are frequently in quantitative agreement with published data. Results obtained for vertical Bow through orifices show the effect of orifice size and conveying air velocity on the rate of dispersion of particle ropes.