论文标题
在周期性剪切颗粒系统中的波动散落和爱德华兹的温度等效
Equivalence of fluctuation-dissipation and Edwards' temperature in cyclically sheared granular systems
论文作者
论文摘要
使用从X射线断层扫描获得的粒子轨迹数据，我们确定了周期性剪切的颗粒系统中的两种有效温度。第一个是从波动散动作定理中获得的，该定理与浸入系统中的较轻的示踪剂颗粒的扩散和迁移率有关。第二个是通过填料体积波动定义的爱德华兹紧凑型。我们发现这两个温度之间的良好一致性与示踪剂的类型，环状剪切幅度和颗粒表面粗糙度无关。我们进一步阐明，在颗粒系统中，粘性的阻力是由于局部接触几何形状的对称性损坏。
Using particle trajectory data obtained from x-ray tomography, we determine two kinds of effective temperatures in a cyclically sheared granular system. The first one is obtained from the fluctuation-dissipation theorem which relates the diffusion and mobility of lighter tracer particles immersed in the system. The second is the Edwards compactivity defined via the packing volume fluctuations. We find robust excellent agreement between these two temperatures, independent of the type of the tracers, cyclic shear amplitudes, and particle surface roughness. We further elucidate that in granular systems the viscous-like drag force is due to the broken symmetry of the local contact geometry.
