石墨烯生产关键设备CFD-DEM模拟
China Powder Science and Technology（2022）
Abstract
针对液相法石墨烯生产关键设备搅拌釜反应器,采用实验和模拟的方法对其内部多相复杂流场特性和规律进行研究.采用流体容积模型两相模型实现搅拌釜内多相流场的预测,并实验验证模型的适用性;采用计算流体动力学和离散元法建模耦合方法,计算片状颗粒在搅拌釜内的运动特性.结果表明:剪切速率在桨叶边缘及搅拌槽边壁附近区域较高,而颗粒主要集中于搅拌槽底部靠近边壁区域,并在底部形成颗粒堆积现象;单颗粒运动轨迹表明,非球形颗粒主体流动沿着流线方向,受底部颗粒堆积的影响,颗粒在运动过程中会在堆积区域停留较长时间;单颗粒受力结果分析发现,颗粒在运动过程中受搅拌桨和边壁的碰撞作用,会受到较大的脉冲力,而该合力持续时间较短,是颗粒运动轨迹改变的主要作用力.
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