232640.fig.007a
(a)
232640.fig.007b
(b)
232640.fig.007c
(c)
232640.fig.007d
(d)
Figure 7: Photographs of arm part according to velocity and pressure (at 75% solid fraction): (1) 0.2 m/s and 300 bar; (2) 0.3 m/s and 300 bar; (3) 0.3 m/s and 450 bar; (4) 0.5 m/s and 450 bar.