Developing flow of a gas‐particle mixture in a vertical riser

A computational study of steady, developing flow of gas‐particle suspensions in a vertical riser has been carried out, using a model based on kinetic theory of granular materials, to understand the role of inlet configuration on the pattern of flow development. Three inlet configurations—uniform inlet, core‐annulus flow at the inlet and circumferential injection of secondary gas—were examined. It is found that the inlet configuration can have a profound impact on the rate of segregation of particles to the wall and the internal recirculation. Circumferential injection of gas has a favorable effect on the flow in the sense that it can decrease the extent of internal recirculation.