THE INFLUENCE OF THE FREQUENCY OF ACOUSTIC-WAVES ON SOUND-ASSISTED FLUIDIZATION OF BEDS OF FINE PARTICLES
THE INFLUENCE OF THE FREQUENCY OF ACOUSTIC-WAVES ON SOUND-ASSISTED FLUIDIZATION OF BEDS OF FINE PARTICLES
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DOI：
10.1016/0032-5910(94)02931-d
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发表时间：
1995-03-01
影响因子：
5.2
通讯作者：
RUSSO, S
中科院分区：
文献类型：
--
作者：
RUSSO, P;CHIRONE, R;RUSSO, S
采用145 mm柱对0.5 ~ 45 μ m催化剂颗粒进行了声助流化研究。不同数量的固体重量为W，从1到3公斤不等，已在该柱中充电。扬声器在床上方产生声场，声压级SPL（指20 mu Pa）范围为110 ~ 140 dB，频率范围为30 ~ 1000hz。W， SPL和f的某些组合所获得的流化质量的改善归因于最初形成床的粉尘分解成亚团簇。对于给定的W和SPL，确定了可以获得无通道均匀流化的频率范围，并在这些范围内概述了子簇大小d(s)作为频率函数的各种曲线。这些曲线的非单调形式不能用原始的声辅助流化模型来解释，该模型假设了一个刚性的粉尘-亚簇结构。簇/子簇振荡子模型假设簇和子簇之间存在弹性力，得出与实验结果趋势相同的理论d(s)与f曲线。
Sound-assisted fluidization of nonfluent 0.5-45 mu m catalyst particles has been studied with a 145 mm i.d. column. Different amounts of solids of weight W ranging from 1 to 3 kg have been charged in the column. A loudspeaker generated an acoustic field, above the bed, with a sound pressure level SPL (referred to 20 mu Pa) varying from 110 to 140 dB and a frequency f varying from 30 to 1000 Hz. The improvement of the quality of fluidization obtained with certain combinations of W, SPL and f has been attributed to the breakup of dusters originally forming the bed into subclusters. For given W and SPL, the ranges of frequency within which channel-free homogeneous fluidization could be obtained have been determined, and within these ranges the kinds of curves for sizes of subclusters d(s) as a function of the frequency have been outlined. The nonmonotonic form of these curves could not be explained by means of the original sound-assisted fluidization model, which assumes a rigid duster-subcluster structure. The existence of elastic forces between clusters and subclusters, assumed by the cluster/subcluster oscillators model, yields theoretical d(s) versus f curves with the same trend as those from experiments.