ZENG Xin, YANG Shaojun, WANG Shengdian, et al. Cluster frequency and existence time in dense transport bed[J]. CIESC Journal, 2013, (5): 1614-1620.DOI: 10.3969/j.issn.0438-1157.2013.05.016.
Cluster characteristics(cluster frequency and cluster existence time)were investigated with wavelet analysis in a cold dense transport bed with Geldart B particle using a fiber optic probe.The superficial gas velocities and solids circulating rate were in the range of 8.2-11.2 m穝-1 and 139-530 kg穖-2穝-1
respectively.The results indicated that large scale clusters were easier to form in the near wall and bottom zone than in the center and the top zone of the riser
respectively.Cluster frequency decreased from center to wall
while cluster existence time increased from center to wall.Cluster frequency increased with increasing superficial gas velocity
while cluster existence time decreased with increasing superficial gas velocity.At the riser bottom
cluster frequency decreased with increasing solids circulating rate while cluster existence time increased with increasing solids circulating rates.