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Hydrodynamics of Continuous Spiral Dryer with Rotatory Conical Sleeves: Experiments versus CFD Simulations
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作者 Xiaojing Wang Yuankui Li +3 位作者 Dongyun Ma Yaqian Liu Yiping Huang Fengxiang Qin 《Transactions of Tianjin University》 EI CAS 2017年第6期511-520,共10页
In this study, a continuous and airtight twin-spiral dryer was developed in accordance with the characteristics and challenges in the process of disposing polysilicon slurry. Computational fluid dynamics (CFD) simulat... In this study, a continuous and airtight twin-spiral dryer was developed in accordance with the characteristics and challenges in the process of disposing polysilicon slurry. Computational fluid dynamics (CFD) simulations were used to investigate the flow field in the rotating twin-spiral continuous dryer and an original discrete phase model was also elaborated to compare with the cold-modeling experimental results. The corresponding flow field was obtained using the available inlet velocity of 0.05–0.3 m/s and the rotational speed of the inner cone of 12–44 r/min, the residence time distribution, and tracked particles trajectory. Results showed that the residence time of the tracer particles in the cone cylinder was about 15.8–25.4% of the time spent out of it, and the particle’s residence time was much shorter in contrast to the rotational speed and inlet velocity. The external ribbon had a larger influence on the fluid, thereby leading to a larger velocity in the region outside the cone compared to that in the region inside the cone. In addition, the appearance of the vortex and boundary layer separation at the back of the ribbon and the spoke bar had secondary diversion effects on the fluid. Furthermore, the inlet velocity had little influence on the flow field while the rotational speed of the cone greatly affected the flow field. Hence, the CFD simulations showed good agreement with the experimental results. © 2017 Tianjin University and Springer-Verlag GmbH Germany 展开更多
关键词 Dryers (equipment) Flow fields Fluid dynamics Inlet flow Polycrystalline materials POLYSILICON Residence time distribution Velocity
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大型径向流反应器中流体均布参数的研究 被引量：15
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作者 李瑞江 陈春燕 +1 位作者 吴勇强 朱子彬 《化学工程》 CAS CSCD 北大核心 2009年第10期28-31,共4页
文中研究了工业规模径向反应器中流体的变质量流动规律,在直径3 m,高7 m的大型径向反应器冷模装置中测定了流道静压变化和穿孔阻力,通过数学拟合获得了动量交换系数和侧流穿孔阻力系数。实验结果表明,大型径向反应器冷模装置测得分流和... 文中研究了工业规模径向反应器中流体的变质量流动规律,在直径3 m,高7 m的大型径向反应器冷模装置中测定了流道静压变化和穿孔阻力,通过数学拟合获得了动量交换系数和侧流穿孔阻力系数。实验结果表明,大型径向反应器冷模装置测得分流和集流动量交换系数Kd和Kc与前人众多的实验室小试单管结果十分相近;而大型冷模的分流和集流侧流穿孔阻力系数dξ和cξ在穿孔流速与主流道流速之比大于2之后分别比实验室小试结果提高了35%和16%左右。上述大型冷模实验研究结果对工业径向流反应器的开发有参考价值。 展开更多
关键词 径向反应器 动量交换系数 侧流穿孔阻力系数 大型冷模实验
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