Effects of shear rates on radial distribution of different types of heavy particles in light media  

作　　者：李敬生 王娟 沈琴 郑宁宁 

机构地区：[1]School of Chemistry and Chemical Engineering,Jiangsu University

出　　处：《中国有色金属学会会刊：英文版》2008年第2期421-425,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50474037)supported by the National Natural Science Foundation of China;Project(BK2006078)supported by the Department ofScience and Technology of Jiangsu Province,China

摘　　要：In order to study distribution properties of different types of heavy particles in light media and to link macro-properties of a system with its micro-structures,radial distribution functions(RDF)of partly charged metallic particles in uni-and bi-polar systems at various shear rates were investigated by Brownian dynamics simulation.The results are good in agreement qualitatively or quantitatively compared with ones in non-polar systems and other works.The investigation indicates that dispersibility of the particles in the uni-polar system of high ionic concentrations is the largest.Therefore,it is the most unfavored to grow into clusters for precipitation.The dispersibility in the bi-polar systems is less than that in uni-polar systems,but larger than that in non-polar systems.Furthermore,all the RDFs at the same shear rates in three systems approach a limit,which implies that a threshold value exists.In order to study distribution properties of different types of heavy particles in light media and to link macro-properties of a system with its micro-structures, radial distribution functions（RDF） of partly charged metallic particles in uni- and bi-polar systems at various shear rates were investigated by Brownian dynamics simulation. The results are good in agreement qualitatively or quantitatively compared with ones in non-polar systems and other works. The investigation indicates that dispersibility of the particles in the uni-polar system of high ionic concentrations is the largest. Therefore, it is the most unfavored to grow into clusters for precipitation. The dispersibility in the bi-polar systems is less than that in uni-polar systems, but larger than that in non-polar systems. Furthermore, all the RDFs at the same shear rates in three systems approach a limit, which implies that a threshold value exists.

关 键 词：分布模式 重微粒 微观结构 合金 

分 类 号：TG115[金属学及工艺—物理冶金]