The uniform mixing of solids is important in many industries, such as the pharmaceutical, food, petrochemical and chemical industries. We numerically investigated the effect of particle size ratio on the mixing of bisized particles in a quasi-two-dimensional vibrationally fluidized bed. The granular binary mixtures comprised spherical particles with different size ratios. Three-dimensional discrete-element simulations agreed with previous experimental results. Convective and diffusive mechanisms occurred within the vibrated bed. The particle size had no significant influence on convective mixing, whereas the diffusive mechanism strengthened for large size ratios. The average particle velocity was larger in a mixture of large size ratios. The stronger diffusive motion and larger average particle velocity caused the particles to mix faster for large size ratios. The final mixing index decreased with size ratio because of the difference between the size and number of small and large particles.

固体的均匀混合在许多行业中都很重要，例如制药，食品，石化和化学工业。我们数值研究了粒度比对准二维振动流化床中双尺寸颗粒混合的影响。粒状二元混合物包含具有不同尺寸比的球形颗粒。三维离散元素模拟与先前的实验结果一致。对流和扩散机制发生在振动床内。粒径对对流混合没有显着影响，而对于较大的粒径比，扩散机理得到加强。在大尺寸比的混合物中，平均粒子速度较大。较大的比例比，较强的扩散运动和较大的平均粒子速度导致粒子混合更快。由于小颗粒和大颗粒的尺寸和数量之间的差异，最终的混合指数随尺寸比而降低。