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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)
Source PublicationPHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
2018-09-01
Volume505Pages:61-68
ISSN0378-4371
AbstractBy 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.
KeywordNon-Gaussian diffusion Simulation Hertzian spheres Ultrasoft particles Dynamic heterogeneity
DOI10.1016/j.physa.2018.03.034
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000437061000006
WOS KeywordCORE MODEL ; LIQUID ; FLUID ; HETEROGENEITIES ; TRANSITION ; DYNAMICS ; BEHAVIOR ; MOTION
WOS Research AreaPhysics, Multidisciplinary
WOS SubjectPhysics
Funding OrganizationNational Natural Science Foundation of China [11572322, 11172302]
Classification二类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77851
Collection国家微重力实验室
Affiliation1.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
Recommended Citation
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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