Open AccessSandwich-like segregation in vertically vibrated binary granular mixtures
Author(s) -
Jiang Ze-Hui,
Lu Kun-Quan,
Meiying Hou,
Wei Chen,
Che n Xiang-Jun
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.2244
Subject(s) - binary number , acceleration , granular material , layer (electronics) , materials science , pattern formation , vibration , granular layer , physics , mechanics , chemical physics , composite material , classical mechanics , mathematics , quantum mechanics , biology , genetics , cerebellum , neuroscience , arithmetic
In a vertically vibrated binary granular mixture, sandwich-like segregation pattern is observed; a layer of large heavy particles is sandwiched in between two layers of small particles. This pattern is different from the double-layer structure, known as the “Brazil nut” effect, where the large heavy particles populate on the top. Our experiments show that such a three-layer structure is a stable pattern. It occurs when the vibration acceleration is beyond a critical threshold. Two different segregation processes are observed. The mechanisms for these two segregation processes are discussed. The dependence of the segregation pr ocesses on the driving frequency f and acceleration Γ, and the size ratio and volume ratio of the particles are also experimentally studied.