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Hydrodynamic couplings of colloidal ellipsoids diffusing in channels

文献类型：期刊论文

作者Zheng ZY(郑中玉)4,5; Xu, Xinliang3; Wang YR(王育人)4,5; Han, Yilong1,2; Wang YR(王育人); Zheng ZY(郑中玉)
刊名JOURNAL OF FLUID MECHANICS
出版日期2021-12-29
卷号933页码:29
关键词colloids Stokesian dynamics microfluidics
ISSN号0022-1120
DOI10.1017/jfm.2021.1062
通讯作者Han, Yilong(yilong@ust.hk)
英文摘要The hydrodynamic interactions (HIs) of two colloidal spheres characterized by the translation-translation (T-T) couplings have been studied under various confinements, but little is known regarding the HIs of anisotropic particles and rotational motions, which are common in nature and industry. Here, we study the T-T, rotation-rotation (R-R) and translation-rotation (T-R) hydrodynamic couplings of two colloidal ellipsoids sediment on the bottoms of channels in experiment, theory and simulation. We find that the degree of confinement and the particle shape anisotropy are critical tuning factors resulting in anomalous hydrodynamic and diffusive behaviours. The negative R-R coupling reflects the tendency of opposite rotations of two neighbouring ellipsoids. The positive T-R coupling reflects that an ellipsoid rotates away from the channel axis as another ellipsoid approaches. As the channel width increases, the positive T-T coupling changes to an abnormal negative coupling, indicating that the single-file diffusion can exist even in wide channels. By contrast, only positive T-T couplings were observed for spheres in channels. The T-T coupling increases with the aspect ratio p. The R-R coupling is the maximum at a moderate p similar to 2.8. The T-R coupling is the maximum at a moderate degree of confinement. The spatial range of HIs is longer than that of spheres and increases with p. We propose a simple model which reproduces some coupling phenomena between two ellipsoids, and it is further confirmed by low-Reynolds-number hydrodynamic simulation. These findings shed new light on anisotropic particle diffusion in porous media, transport through membranes, microfluidics and microrheology.
分类号一类/力学重要期刊
WOS关键词DISCRETIZED BOLTZMANN-EQUATION ; PARTICULATE SUSPENSIONS ; NUMERICAL SIMULATIONS ; BROWNIAN DYNAMICS ; FLOW ; PARTICLES ; MOBILITIES ; STOKESLET ; OBJECTS ; ROLES
资助项目National Natural Science Foundation of China[11372314] ; National Natural Science Foundation of China[U1738118] ; National Natural Science Foundation of China[11974038] ; National Natural Science Foundation of China[U1930402] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040301] ; Guangdong Basic and Applied Basic Research Foundation grant[2020B1515120067] ; Hong Kong Research Grants Council under the Collaborative Research Fund[C6016-20G]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000735399800001
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Guangdong Basic and Applied Basic Research Foundation grant ; Hong Kong Research Grants Council under the Collaborative Research Fund
其他责任者Han, Yilong
源URL[http://dspace.imech.ac.cn/handle/311007/88233]  
专题力学研究所_国家微重力实验室
作者单位1.Hong Kong Univ Sci & Technol, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China;
3.Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China;
4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
5.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Zheng ZY,Xu, Xinliang,Wang YR,et al. Hydrodynamic couplings of colloidal ellipsoids diffusing in channels[J]. JOURNAL OF FLUID MECHANICS,2021,933:29.
APA 郑中玉,Xu, Xinliang,王育人,Han, Yilong,Wang YR,&Zheng ZY.(2021).Hydrodynamic couplings of colloidal ellipsoids diffusing in channels.JOURNAL OF FLUID MECHANICS,933,29.
MLA 郑中玉,et al."Hydrodynamic couplings of colloidal ellipsoids diffusing in channels".JOURNAL OF FLUID MECHANICS 933(2021):29.

入库方式： OAI收割

来源：力学研究所

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