Slow relaxation dynamics of clogs in a vibrated granular silo.

摘要: We experimentally explore the vibration-induced unclogging of arches halting flow in a two-dimensional silo. The endurance is determined by carrying out survival analysis their breaking times. By analyzing dynamics two morphological variables, we demonstrate that evolve toward less regular structures and it seems there may exist certain degree irregularity arch reaches before collapsing. Moreover, put forward σ (the standard deviation all angles between consecutive beads) describes faithfully evolution arch. Focusing on long-lasting arches, study calculating its two-time autocorrelation function mean-squared displacement. In particular, apparent logarithmic increase correlation decrease displacement when waiting time increased reveal slowing down dynamics. This behavior clear hallmark aging phenomena confirms lack ergodicity Our findings provide new insights how an tends to destabilize probability breaks with long sustained vibration decreases time.