Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity |
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Authors: | Pei Pei Kai Zhang Gang Xu Yongping Yang Dongsheng Wen |
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Affiliation: | 1. Beijing Shenwu Environment & Energy Technology Corporation, Beijing 102200, China;2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;3. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK |
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Abstract: | 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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