Hydrodynamic couplings of colloidal ellipsoids diffusing in channels

doi:10.1017/jfm.2021.1062

	Hydrodynamic couplings of colloidal ellipsoids diffusing in channels
	Zheng ZY(郑中玉)4,5; Xu, Xinliang 3; Wang YR(王育人)4,5; Han, Yilong 1,2
刊名	JOURNAL OF FLUID MECHANICS
	2021-12-29
卷号	933 页码:29
关键词	colloids Stokesian dynamics microfluidics
ISSN号	0022-1120
DOI	10.1017/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
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关键词	DISCRETIZED BOLTZMANN-EQUATION ; PARTICULATE SUSPENSIONS ; NUMERICAL SIMULATIONS ; BROWNIAN DYNAMICS ; FLOW ; PARTICLES ; MOBILITIES ; STOKESLET ; OBJECTS ; ROLES
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
内容类型	期刊论文
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.(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.