Granular temperature distribution in a gas fluidized bed of hollow microparticles prior to onset of bubbling
Granular temperature distribution in a gas fluidized bed of hollow microparticles prior to onset of bubbling
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DOI：
10.1209/epl/i2005-10526-y
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发表时间：
2006-04
期刊：
影响因子：
1.8
通讯作者：
Liansong Xie;M. Biggs;D. Glass;A. S. McLeod;S. Egelhaaf;G. Petekidis
中科院分区：
文献类型：
--
作者：
Liansong Xie;M. Biggs;D. Glass;A. S. McLeod;S. Egelhaaf;G. Petekidis
目前还不清楚是否需要气泡来诱导气体流化床（FB）中的颗粒速度波动。我们表明，气泡是不必要的，通过应用扩散波光谱的颗粒，其最小鼓泡速度约为5倍的最小流化速度。波动首先在流化时或流化之上观察到，并且随着表观速度的增加而增加。床中的速度波动的分布也被提出：它们是对称的中心线，它们是最大的，并增加与高度以上的分配器。
It has been unclear whether bubbles are required to induce particle velocity fluctuations in gas fluidized beds (FBs). We show that bubbles are not necessary by applying diffusing-wave spectroscopy to particles whose minimum bubbling velocity is approximately 5 times that of the minimum fluidization velocity. Fluctuations are first observed at or just above fluidization and increase in magnitude with superficial velocity. The distribution of velocity fluctuations in the bed is also presented: they are symmetrical about the centreline where they are maximal and increase with height above the distributor.