The Blocking Mechanism of the Vertical Feeding System of Roadside Support Body Material for Backfilling Gob-Side Entry Retaining

Figure 20

Vector diagram of flow field rate with different vent diameters. (a) Vent diameter of 10 mm. (b) Vent diameter of 30 mm. (c) Vent diameter of 50 mm. (d) Vent diameter of 70 mm. (e) Vent diameter of 90 mm.

(a)

(b)

(c)

(d)

(e)