Fig. 2 illustrates predicted results of particle velocity
and gas–solid relative velocity along the ?ow direction.
For comparison, the experimental measurements [15]
are illustrated in Fig. 2. Obviously, the gas–solid relative
velocity is higher in the impinging zone than in other
zones, which is favorable for enhancing semi-circular
impinging stream drying.
Fig. 3 presents the predicted time of a particle ?rst
accelerating and decelerating at various gas velocities.
The time initial to accelerate and decelerate decrease as