The Movement Characteristics of Coal Granular Body in Excavating Rescue Channel in the Collapsed Body

Figure 12

Change trend of velocity field of coal particle excavation. (a) Initial collapse of the lower left part of 0.1 m coal particles. (b) The collapsing process of the lower left part of 0.1 m coal particles. (c) The collapsing process of the lower middle part of 0.1 m coal particles.

(a)

(b)

(c)