Figure 4 Influence of the volume fraction of the fragment on experimental breakup time. (a) System No.1, N = 330 rpm; (b) System No.1, N = 390 rpm; (c) System No.1, N = 480 rpm; (d) System No.2, N = 330 rpm; (e) System No.3, N = 330 rpm; (f) System No.4, N = 480 rpm ; (g) System No.5, N = 480 rpm.