Kim Kipom, Moon Jong Kyun, Park Jong Jin, Kim Hyung Kook, Pak Hyuk Kyu
Department of Physics, Pusan National University, Busan, Korea.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jul;72(1 Pt 1):011302. doi: 10.1103/PhysRevE.72.011302. Epub 2005 Jul 8.
The dynamics of the jamming transition in a three-dimensional granular system under vertical vibration is studied using diffusing-wave spectroscopy. When the maximum acceleration of the external vibration is large, the granular system behaves like a fluid, with the dynamic correlation function G (t) relaxing rapidly. As the acceleration of vibration approaches the gravitational acceleration g , the relaxation of G (t) slows down dramatically, and eventually stops. Thus the system undergoes a phase transition and behaves like a solid. Near the transition point, we find that the structural relaxation shows a stretched exponential behavior. This behavior is analogous to the behavior of supercooled liquids close to the glass transition.
利用扩散波谱学研究了垂直振动下三维颗粒系统中阻塞转变的动力学。当外部振动的最大加速度较大时，颗粒系统表现得像流体，动态关联函数G(t)迅速弛豫。随着振动加速度接近重力加速度g，G(t)的弛豫显著减慢，最终停止。因此，系统经历相变并表现得像固体。在转变点附近，我们发现结构弛豫呈现出拉伸指数行为。这种行为类似于接近玻璃化转变的过冷液体的行为。
