Experimental and DEM studies on the particle mixing performance in rotating drums: Effect of area ratio
Experimental and DEM studies on the particle mixing performance in rotating drums: Effect of area ratio
复制标题
转鼓内颗粒混合性能的实验和 DEM 研究：面积比的影响
DOI：
10.1016/j.powtec.2017.01.044
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发表时间：
2017
影响因子：
5.2
通讯作者：
Shengqiang Jiang
中科院分区：
文献类型：
--
作者：
Xiangwu Xiao;Yuanqiang Tan;Hao Zhang;Rong Deng;Shengqiang Jiang
采用离散元法（DEM）模拟了不同转速和填充度下，等粒径丙烯腈-丁二烯-苯乙烯共聚物珠粒在转鼓内的混合过程。通过高回弹试验、摩擦磨损试验、堆积角试验和L盒试验，确定了DEM模型的接触参数。通过与实验结果的比较，验证了离散元模拟的有效性。在对模拟结果进行数理统计分析的基础上，提出了以混合度和混合时间表征颗粒混合性能的定量判据。提出了一个新的参数C，即活性区面积与整个床层面积的比值，用以描述混合过程中活性区的大小。数值结果表明，参数C对混合时间有显著影响，但对混合度影响不大。随着转速的增加和填充度的降低，参数C增大，混合时间缩短。
The mixing processes of equal-sized acrylonitrile butadiene Styrene copolymers beads in a rotating drum were simulated using the Discrete Element Method (DEM) at different rotational speeds and filling degrees. The contacting parameters of the DEM models were determined by a series of experiments including high rebound test, friction and wear test, stacking angle test and L-box test. The validity of the DEM simulations was confirmed by comparing the numerical results with the experimental ones. Quantitative criteria of particles mixing performance which is characterized by the mixing degree and mixing time were proposed based on the mathematical statistical analysis of simulation results. A new parameter C which is defined as the ratio of the active region area to the whole bed area was suggested to describe the active region in the mixing process. Our numerical results reveal that the parameter C has a significant influence on the mixing time but little influence on the mixing degree. With the increase of the rotational speed and the decrease of the filling degree, the parameter C increases but the mixing time decreases.