| dc.description.abstract | In the study of granular vibration, particle shape, vibration frequency f, and dimensionless vibration acceleration Γ are critical factors influencing dynamic behavior. This study systematically investigates the dynamic behavior of Platonic solid particles and spherical particles with varying shapes through vibration bed experiments under different vibration conditions. Five Platonic solids were selected for the study, including tetrahedron, cube, octahedron, dodecahedron, and icosahedron, with sphericities of 0.6276, 0.8172, 0.8573, 0.923, and 0.9523, respectively, and corresponding single-face areas of 9.81, 5.45, 3.90, 2.41, and 1.40 ?mm?^2. This paper focuses on analyzing the effects of sphericity, vibration frequency, and dimensionless vibration acceleration on recirculation intensity, granular temperature, and particle mixing, while further exploring the role of the single-face area of Platonic solid particles. The results show that with an increase in Γ (i.e., enhanced energy input to the vibration bed), the recirculation intensity and granular temperature of the particles significantly increase. However, under the same acceleration conditions, increasing the vibration frequency reduces the amplitude, decreases the energy input, and consequently leads to a reduction in recirculation intensity and granular temperature. As sphericity increases (corresponding to a decrease in single-face area), the friction between particles is reduced, resulting in lower energy dissipation and further increases in recirculation intensity and granular temperature. Under the vibration condition of f=40 Hz, the recirculation intensity and granular temperature of cubic particles are significantly lower than those of other shapes, even lower than those of tetrahedral particles with lower sphericity. This indicates that, under high-frequency and low-amplitude conditions, cubic particles are more prone to accumulate at the bottom of the vibration bed container, restricting their mobility and dynamic behavior.
Additionally, binary mixing experiments of Platonic solid particles and spherical particles revealed that at high Γ values, the final mixing degree of all particle shapes is similar. However, under low Γ conditions, particles with higher sphericity achieve better final mixing than those with lower sphericity. This indicates that the dynamic behavior of high-sphericity particles under low-amplitude conditions is more conducive to enhancing the mixing effect. This study provides a comprehensive understanding of the combined effects of particle shape and vibration parameters on the dynamic behavior of granular flow, offering valuable insights for optimizing particle separation and mixing performance in vibration bed systems. | en_US |