U-slip is used to calculate the drag coefficient in EMMS/bubbling model. But there are three different slip velocities in the model. I do not know which one should be chosen here. And my calculation results are a little bit different from the references.
The references I used are as follow:
[1]HONG K, SHI Z, WANG W, et al. A structure-dependent multi-fluid model (SFM) for heterogeneous gas–solid flow [J]. Chemical Engineering Science, 2013, 99: 191-202.
[2]SHI Z, WANG W, LI J. A bubble-based EMMS model for gas–solid bubbling fluidization [J]. Chemical Engineering Science, 2011, 66(22): 5541-55.
Zhenghang Luo
According to one of the authors of this model, the U-slip used in this model equals the superficial gas velocity at the gas inlet of the fluidized bed.
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