旋转滚筒内颗粒原料的混合是能源、材料、制药等领域内必要的工业过程。柔性生物质颗粒区别于刚性颗粒，具有易压缩变形、长径比大等特性，使其逐渐成为了各大行业内的研究焦点。本研究以烟丝颗粒为实验对象，通过定制多个缩小比例的滚筒装置进行实验，系统考察了滚筒转速、颗粒填充度、壁面摩擦系数以及耙钉数目和尺寸等多个关键变量，并引入动态休止角和混合指数来定量表征颗粒在滚筒内的流动力学行为。同时基于离散单元法（DEM）对烟丝颗粒进行数值研究，在充分考虑烟丝颗粒形状差异和尺寸分布的情况下对其进行建模，探究了滚筒转速、颗粒填充度、壁面滑动摩擦系数以及颗粒间滑、滚动摩擦系数等参数，并与相同条件下获得的实验数据进行了比较。期望结合实验和数值模拟的数据结果得到最佳参数组合，以更好地预测颗粒的混合。
        The mixing of granular materials in rotating drums is an indispensable industrial process in the fields of energy, materials and pharmaceuticals, etc. Flexible biomass granules are distinguished from rigid granules by their ease of compression and deformation and their high aspect ratio, which has gradually made them the focus of research in major industries. In this study, the experiments with tobacco particles were carried out by means of the adaptation of several drum devices with a reduced scale. Several key variables such as drum rotation speed, particle filling degree, wall friction coefficient and number and size of flights were systematically investigated, and the dynamic angle of repose and mixing index were introduced to quantitatively characterise the flow dynamics of the particles inside the drum. At the same time, The tobacco particles were also studied numerically using the Discrete Element Method (DEM) and modelled taking into account the differences in shape and size distribution of the tobacco particles, and parameters such as the drum rotational speed, particle filling degree, wall sliding friction coefficient, and interparticle sliding and rolling friction coefficients were investigated and compared with the experimental data obtained under the same conditions. It is expected that the optimal combination of parameters will be obtained by combining the data results from experiments and numerical simulations for better prediction of particle mixing.

 

离散单元法,旋转滚筒,柔性生物质颗粒,休止角,颗粒混合