物理学报2012，Vol.61Issue(13)：273-280,8.
振动颗粒物质“巴西果＂分离效应实验和理论研究
Experimental and theoretical investigations of the effect of ＂Brazil Nut＂ segregation in vibrating granular matters
摘要
Abstract
Size segregation is one of important properties of vibrating granular matters. It is significant to understand and study the segregation mechanisms and parameter range of controlling factors of mixed granular matters for the development of industry, agriculture and pharmaceutical. In this paper, we investigate the influence factors and physical mechanisms of ＂Brazil Nut＂ segregation experimentally and theoretically. The influences of vibrating acceleration, sizes and densities of large and small granules on the segregation time are analyzed. The hydro-model is used to evaluate segregation time and explain the experimental results qualitatively. Results show that the vibration acceleration is a main controlling factor for ＂Brazil Nut＂ segregation in the case of fixed frequency. There is a critical acceleration. When the acceleration is larger then its critical value the main physical mechanism changes from convection to filling voids, and the effect of acceleration on segregation decreases, while the effect of size of large granule on it increases. Furthermore, ＂Brazil Nut＂ segregation still arises when the density ratio is equal to 1. The increase of the size or density of small granular may enhance ＂Brazil Nut＂ segregation.关键词
颗粒物质/“巴西果”分离/分离时间/分离机理Key words
granular matter/'Brazil Nut' segregation/segregation time/segregation mechanism分类
数理科学引用本文复制引用
彭亚晶,张卓,王勇,刘小嵩..振动颗粒物质“巴西果＂分离效应实验和理论研究[J].物理学报,2012,61(13):273-280,8.
