کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
672246 | 887493 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity](/preview/png/672246.png)
Under the Eulerian–Eulerian framework of simulating gas–solid two-phase flow, the accuracy of the hydrodynamic prediction is strongly affected by the selection of rheology of the particulate phase, for which a detailed assessment is still absent. Using a jetting fluidized bed as an example, this work investigates the influence of solid rheology on the hydrodynamic behavior by employing different particle-phase viscosity models. Both constant particle-phase viscosity model (CVM) with different viscosity values and a simple two-fluid model without particle-phase viscosity (NVM) are incorporated into the classical two-fluid model and compared with the experimental measurements. Qualitative and quantitative results show that the jet penetration depth, jet frequency and averaged bed pressure drop are not a strong function of the particle-phase viscosity. Compared to CVM, the NVM exhibits better predictions on the jet behaviors, which is more suitable for investigating the hydrodynamics of gas–solid fluidized bed with a central jet.
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► The effect of particulate rheology on jetting dynamics in a fluidized bed is investigated.
► Different viscosity model are examined and compared with the experiments.
► Constant viscosity model with particle viscosity of 0.10–1.00 Pa s is in agreement with the experiments.
► A simple two-fluid model with zero particle viscosity can predict jetting behaviors.
Journal: Particuology - Volume 10, Issue 4, August 2012, Pages 444–449