湿颗粒中的冷却和聚集
Cooling and aggregation in wet granulates
摘要：
湿颗粒材料的特征在于它们的颗粒相互作用中的限定的键能，使得键的断裂意味着固定量的能量的不可逆损失。与键能相关的是非平衡转变，当颗粒温度低于键能时发生。随后的聚集成团的颗粒被证明是一个自相似的生长过程与簇的大小分布，服从缩放。在聚集的早期阶段，团簇是分形的，D_f=2，在以后的时间，我们观察到凝胶化。我们使用简单的缩放参数来推导出在冷却的早期和后期阶段的温度衰减，并验证我们的结果与事件驱动的模拟。
英文摘要：
Wet granular materials are characterized by a defined bond energy in their particle interaction such that breaking a bond implies an irreversible loss of a fixed amount of energy. Associated with the bond energy is a nonequilibrium transition, setting in as the granular temperature falls below the bond energy. The subsequent aggregation of particles into clusters is shown to be a self-similar growth process with a cluster size distribution that obeys scaling. In the early phase of aggregation the clusters are fractals with D_f=2, for later times we observe gelation. We use simple scaling arguments to derive the temperature decay in the early and late stages of cooling and verify our results with event-driven simulations.
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