论文标题
在台式脉冲流化床中的异常扩散
Anomalous Diffusion in a Bench-Scale Pulsed Fluidized Bed
论文作者
论文摘要
我们介绍了对台式脉冲流化床的微风学的分析，该床代表了一个弱关闭的系统。脉冲流引起的非线性气体粒子和颗粒粒子相互作用与谐波和亚谐波模式有关。虽然在中尺度观察到周期性的结构化气泡模式，但粒子尺度的测量结果揭示了驱动的颗粒介质中的异常扩散。我们使用单粒子轨道在两个具有不同中尺度特征的脉冲频率下分析牙齿和衰老特性。合奏平均平方位移的缩放并非唯一。时间平均平方平方位移的分布是非高斯，不对称的，并且在拥挤的准静态环境中具有有限的微不足道贡献。结果表明，弱牙的破裂，随着老化的特征，非平衡性动力学的表征。
We present our analysis on micro-rheology of a bench-scale pulsed fluidized bed, which represents a weakly confined system. Non-linear gas-particle and particle-particle interactions resulting from pulsed flow are associated with harmonic and sub-harmonic modes. While periodic structured bubble patterns are observed at the meso-scale, particle-scale measurements reveal anomolous diffusion in the driven granular medium. We use single-particle tracks to analyze ergodicity and ageing properties at two pulsing frequencies having remarkably different meso-scale features. The scaling of ensemble-averaged mean squared displacement is not unique. The distribution of time-averaged mean squared displacements is non-Gaussian, asymmetric and has a finite trivial contribution from particles in crowded quasi-static surroundings. Results indicate weak ergodicity breaking which along with ageing characterize the non-stationary and out-of-equilibrium dynamics.
