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Anomalous and non-Gaussian diffusion in Hertzian spheres
欧阳文泽; Sun B; Sun ZW(孙祉伟); Xu SH(徐升华)
2018-09-01
发表期刊PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
卷号505页码:61-68
ISSN0378-4371
摘要By means of molecular dynamics simulations, we study the non-Gaussian diffusion in the fluid of Hertzian spheres. The time dependent non-Gaussian parameter, as an indicator of the dynamic heterogeneity, is increased with the increasing of temperature. When the temperature is high enough, the dynamic heterogeneity becomes very significant, and it seems counterintuitive that the maximum of non-Gaussian parameter and the position of its peak decrease monotonically with the increasing of density. By fitting the curves of self intermediate scattering function, we find that the character relaxation time tau(alpha) is surprisingly not coupled with the time tau(max) where the non-Gaussian parameter reaches to a maximum. The intriguing features of non-Gaussian diffusion at high enough temperatures can be associated with the weakly correlated mean-field behavior of Hertzian spheres. Especially the time tau(max) is nearly inversely proportional to the density at extremely high temperatures. (C) 2018 Elsevier B.V. All rights reserved.
关键词Non-Gaussian diffusion Simulation Hertzian spheres Ultrasoft particles Dynamic heterogeneity
DOI10.1016/j.physa.2018.03.034
URL查看原文
收录类别SCI ; EI
语种英语
WOS记录号WOS:000437061000006
关键词[WOS]CORE MODEL ; LIQUID ; FLUID ; HETEROGENEITIES ; TRANSITION ; DYNAMICS ; BEHAVIOR ; MOTION
WOS研究方向Physics, Multidisciplinary
WOS类目Physics
项目资助者National Natural Science Foundation of China [11572322, 11172302]
论文分区二类
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77851
专题国家微重力实验室
作者单位1.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China
2.Zhongyuan Univ Technol, Sch Mat & Chem Engn, Zhengzhou 450007, Henan, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
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GB/T 7714
欧阳文泽,Sun B,Sun ZW,et al. Anomalous and non-Gaussian diffusion in Hertzian spheres[J]. PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS,2018,505:61-68.
APA 欧阳文泽,Sun B,孙祉伟,&徐升华.(2018).Anomalous and non-Gaussian diffusion in Hertzian spheres.PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS,505,61-68.
MLA 欧阳文泽,et al."Anomalous and non-Gaussian diffusion in Hertzian spheres".PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 505(2018):61-68.
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