Particle Size Segregation in Granular Mass Flows With Different Ambient Fluids

doi:10.1029/2020JB019536

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Particle Size Segregation in Granular Mass Flows With Different Ambient Fluids
	Zhou, Gordon G. D.1,2; Cui, Kahlil F. E.1,2; Jing, Lu 3,4; Zhao, Tao 1,5; Song, Dongri 1,2; Huang, Yu 6
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2020-10-01
卷号	125 期号:10 页码:e2020JB019536
ISSN号	2169-9313
DOI	10.1029/2020JB019536
通讯作者	Cui, Kahlil F. E.(kfcui@imde.ac.cn)
产权排序	1
文献子类	Article
英文摘要	Size segregation, which is a robust feature of sheared granular mixtures and geophysical mass flow deposits, is found to diminish in the presence of a viscous fluid. We study this inhibitive effect through coupled fluid-particle simulations of granular flows fully immersed in different ambient fluids. Granular-fluid mixture flows are modeled according to three distinct flow regimes-free fall, fluid inertial, and viscous-at different angles of inclination. Each flow regime corresponds to distinct flow dynamics and segregation behaviors. We find that segregation is indeed weaker and slower in the presence of an ambient fluid, which is more so as the flow becomes more viscous. The ambient fluid affects segregation in two major ways. First, buoyancy reduces the contact pressure gradients which are needed to drive large particles up, while at the same time reduces the particles' apparent weight. On the other hand, the streamwise drag force substantially changes the flow rheology, specifically the shear rate profile, thereby modifying the segregation behavior in the normal direction. Surprisingly, the fluid drag in the normal direction is negligible regardless of the fluid viscosity and does not affect segregation in a direct manner.
电子版国际标准刊号	2169-9356
资助项目	National Natural Science Foundation of China[41941017] ; National Natural Science Foundation of China[11672318] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS)[QYZDB-SSW-DQC010] ; CAS Light of West China Program ; CAS-TWAS President's Fellowship for International PhD students
WOS关键词	YIELD-STRESS FLUID ; DEPOSITIONAL MECHANISMS ; MIXTURE THEORY ; MORPHOLOGY ; SIMULATION ; REGIMES ; RUNOUT ; MODEL
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000604458900005
资助机构	National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; CAS Light of West China Program ; CAS-TWAS President's Fellowship for International PhD students
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/55201]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Cui, Kahlil F. E.
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Univ Hong Kong, Dept Civil Engn, Hong Kong, Peoples R China 4.Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL USA 5.Brunel Univ London, Dept Civil & Environm Engn, London, England 6.Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Gordon G. D.,Cui, Kahlil F. E.,Jing, Lu,et al. Particle Size Segregation in Granular Mass Flows With Different Ambient Fluids[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(10):e2020JB019536.
APA	Zhou, Gordon G. D.,Cui, Kahlil F. E.,Jing, Lu,Zhao, Tao,Song, Dongri,&Huang, Yu.(2020).Particle Size Segregation in Granular Mass Flows With Different Ambient Fluids.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(10),e2020JB019536.
MLA	Zhou, Gordon G. D.,et al."Particle Size Segregation in Granular Mass Flows With Different Ambient Fluids".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.10(2020):e2020JB019536.