Table 3. Average Velocities and Collision Frequency as Calculated from the Recorded Experiments and the DEM Simulation.

milling frequency (Hz)	ball diameter (mm)	average velocity (m/s)	average velocity DEM (m/s)	collision frequency (1/s)
30	17.5	2.57	2.57	60
	20.6	2.50	2.49	60
27.5	17.5	2.44	2.42	55
	20.6	2.29	2.28	55
25	17.5	2.25	2.26	50
	20.6	2.13	2.14	50
22.5	17.5	2.07	2.07	45
	20.6	1.86	1.95	45