物理学报Issue(13)：1-10,10.DOI:10.7498/aps.64.134503
振动颗粒混合物中的周期性分聚现象与能量耗散∗
Energy dissipation and p erio dic segregation of vibrated binary granular mixtures
摘要
Abstract
For a vertically vibrating column filled with binary mixtures consisting of big copper beads and small glass beads, the phenomenon of periodic segregation (PS) is observed experimentally, in which distinct segregation patterns of Brazil nut effect (BNE), reversed Brazil nut (RBN) and sandwich (SW) are emerged successively under a certain vibration condition. The periodic time increases with increasing vibration frequency or decreasing acceleration, and the SW pattern holds 90% duration of a cycle. Since the three segregation patterns emerging sequentially in a cycle are all well defined, the energy dissipation power for each segregation pattern is measured under the same vibration condition. It is found that the dissipation power is the largest in RBN pattern and the smallest in BNE pattern during a cycle. Moreover, in the periodic segregation region the same patterns (BNE, RBN or SW) emerging at different vibration accelerations have almost the same dissipation power within the experimental error. Based on the viewpoint of competition between condensation and percolation from Hong, the periodic segregation phenomenon can be explained qualitatively by combining with our measurements of energy dissipation power.关键词
颗粒物质/能量耗散/分聚Key words
granular matter/energy dissipation/segregation引用本文复制引用
何菲菲,彭政,颜细平,蒋亦民..振动颗粒混合物中的周期性分聚现象与能量耗散∗[J].物理学报,2015,(13):1-10,10.基金项目
国家自然科学基金(批准号:11274390)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.11274390) （批准号:11274390）
