谷物混合物的最大吸收率：数值模拟研究
États de compacité maximale pour les mélanges binaires de grains sphériques : étude par simulation numérique
摘要：
采用离散元数值模拟方法，研究了单分散和双分散球形颗粒在直径比为3时具有最大堆积率的无序组装体。最大填充分数值对应于刚性无摩擦颗粒在各向同性载荷下的平衡态。尺寸效应的统计研究，使人们能够评估，在大系统的限制，最大的包装分数的单分散组件，检索到的常规值0.639，和bidisperse的，两个不同的值的粗颗粒体积分数。一个持久的初始组装步骤，其中搅拌的颗粒通过碰撞相互作用，诱导增加最终的包装分数由于结晶顺序成核的单分散系统或二元混合物的逐步偏析。尽管在许多实际情况下缓慢和适度，这种效应导致随机紧密堆积状态的定义，作为在快速组装过程的限制下在各向同性压力下用无摩擦刚性颗粒获得的状态。一些潜在的扩展，这一初步研究的建议。
英文摘要：
Disordered assemblies with maximum packing fraction are studied by discrete element numerical simulation for monodisperse or bidisperse spherical particles, the diameter ratio being set at three. A maximum packing fraction value corresponds to an equilibrium state under isotropic loading of rigid frictionless particles. A statistical study of size effects enables one to evaluate, in the limit of large systems, the maximum packing fractions of both monodisperse assemblies, for which the conventional value 0.639 is retrieved, and bidisperse ones, for two distinct values of the coarse particle volume fraction. An enduring initial assembling step in which agitated grains interact through collisions induces an increase in the final packing fraction due to crystalline order nucleation for a monodisperse system or to a gradual segregation for a binary mixture. Albeit slow and moderate in a number of practical situations, this effect leads to a definition of the random close packing state, as the one obtained with frictionless rigid grains under an isotropic pressure in the limit of fast assembling processes. A few potential extensions to this preliminary study are suggested.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
