As shown in Fig. 1, after entering a semi-circular
several distinct semi-circular impinging streams includ- dryer, the multi-phase ?ow with particles separates into
ing one-stage semi-circular impinging stream drying and two streams, and is accelerated along each semi-circle
two-stage semi-circular impinging stream drying, as well tube. On the exit end, two streams form opposite im-
as the combined system of vertical and semi-circular pingement. Particles get into opposite gas stream and
impinging stream drying [14–18]. The particle velocities decelerated gradually. After one or a few times of for