论文标题
粒状系统中摩擦控制的熵稳定性竞争
Friction-controlled entropy-stability competition in granular systems
论文作者
论文摘要
使用循环剪切驱动二维颗粒系统，我们确定了不同粒子间摩擦系数的结构特征。这些特征是机械稳定性和熵之间竞争的结果，后者的作用随摩擦而增加。我们表明，单独使用无参数的最大透气参数可以预测指数的细胞顺序分布，并且与实验观察结果非常吻合。我们表明，摩擦只会调节平均细胞顺序，因此，指数衰减率和填料分数。我们进一步表明，在此类系统中可能非常大的细胞是短暂的，这意味着我们的系统是液体样而不是玻璃的。
Using cyclic shear to drive a two dimensional granular system, we determine the structural characteristics for different inter-particle friction coefficients. These characteristics are the result of a competition between mechanical stability and entropy, with the latter's effect increasing with friction. We show that a parameter-free maximum-entropy argument alone predicts an exponential cell order distribution, with excellent agreement with the experimental observation. We show that friction only tunes the mean cell order and, consequently, the exponential decay rate and the packing fraction. We further show that cells, which can be very large in such systems, are short-lived, implying that our systems are liquid-like rather than glassy.
