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Hydrodynamics and mixing process in a horizontal self-cleaning opposite-rotating twin-shaft kneader
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2021-04-22 , DOI: 10.1016/j.ces.2021.116700
Wenkai Cheng , Sicheng Xin , Shichang Chen , Xianming Zhang , Wenxing Chen , Jiajun Wang , Lianfang Feng

The finite element method (FEM) simulation was adopted to investigate the hydrodynamics in an opposite-rotating horizontal self-cleaning twin-shaft kneader with a highly viscous Newtonian fluid. The complicated motion of impellers was simulated by using the mesh superposition technique (MST). The particle tracking technique was used to evaluate the mixing process. The stretching rate from the trajectories of particles was quantitatively characterized to calculate the mixing efficiency. A small visual experimental apparatus was also designed to study the mixing process. The mixing processes by visual experiment show good agreement with the FEM simulation data. The velocity and shear rate are larger in the faster rotation speed side since the rotation speeds of these two shafts differs. The kneading bars on the left and right shaft only intermesh in the center of the overlapping zone. There exists the material exchange between the left and right chamber due to periodical intermeshing interaction. The intermeshing kneading bars split the center-initial cluster into two parts and push them into the left and right region of the lower part of the kneader, respectively. The mean length of stretch increases exponentially with time. The mean value of the mixing efficiency remains positive at all times.



中文翻译:

卧式自清洁对置双轴捏合机的流体动力学和混合过程

采用有限元方法(FEM)模拟研究了具有高粘性牛顿流体的反向旋转卧式自清洁双轴捏合机的流体动力学。叶轮的复杂运动是通过使用网格叠加技术(MST)进行模拟的。粒子跟踪技术用于评估混合过程。从颗粒轨迹的拉伸速率被定量表征以计算混合效率。还设计了一个小型的视觉实验设备来研究混合过程。目测实验表明混合过程与有限元模拟数据吻合良好。由于这两个轴的转速不同,因此在转速较高的一侧速度和剪切率较大。左右轴上的捏合棒仅在重叠区域的中心互相啮合。由于周期性的相互啮合,在左右腔室之间存在物质交换。相互啮合的捏合棒将中心初始簇分为两部分,分别将其推入捏合机下部的左右区域。拉伸的平均长度随时间呈指数增长。混合效率的平均值始终保持为正。拉伸的平均长度随时间呈指数增长。混合效率的平均值始终保持为正。拉伸的平均长度随时间呈指数增长。混合效率的平均值始终保持为正。

更新日期:2021-05-07
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