Upstream swimming and Taylor dispersion of active Brownian particles

Peng, Zhiwei; Brady, John F.

doi:10.1103/physrevfluids.5.073102

Cited by 38 publications

(53 citation statements)

References 61 publications

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“…Peng and Brady 55 made a similar observation as the above-mentioned response that lines of different M / D s overlap and grow as Pe 2 under a strong hydrodynamic flow. They investigated the hydrodynamic dispersion of active Brownian particles in a parallel-plate channel.…”

Section: Exact Solutions To Spreading Of a Thin Slab Of Log-sensing C...supporting

confidence: 62%

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Tuning chemotactic and diffusiophoretic spreading via hydrodynamic flows

et al. 2022

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Section: Exact Solutions To Spreading Of a Thin Slab Of Log-sensing C...supporting

confidence: 62%

“…4. Underlying the same observation between the two studies is a competition between hydrodynamic dispersion and another mechanism: in Peng and Brady 55 the active motion of the colloids, whereas in ours the solute-driven chemotactic/diffusiophoretic colloid transport.…”

Section: Exact Solutions To Spreading Of a Thin Slab Of Log-sensing C...mentioning

confidence: 57%

Tuning chemotactic and diffusiophoretic spreading via hydrodynamic flows

et al. 2022

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“…In fact, the Robin condition, or the no-penetration condition for the probability flux, can be viewed as a ‘reflective’ condition for the boundaries in the phase space with treated as an extra position coordinate. Another similar treatment puts swimmers that exceed a wall back exactly at the wall, which is called a potential-free algorithm (Heyes & Melrose 1993; Duzgun & Selinger 2018; Peng & Brady 2020). In the simulation, we use a small time step to capture the transient transport process.…”

Section: Figure 19mentioning

confidence: 99%

“…of active particles in the position–orientation space (Enculescu & Stark 2011; Elgeti & Gompper 2013; Ezhilan & Saintillan 2015; Alonso-Matilla, Chakrabarti & Saintillan 2019; Jiang & Chen 2019 a ; Berlyand et al. 2020; Peng & Brady 2020). Using this no-penetration condition for the probability flux at the boundaries, the wall accumulation phenomenon can be readily realised in numerical simulations (Bearon & Hazel 2015; Ezhilan & Saintillan 2015; Nili et al.…”

Section: Introductionmentioning

confidence: 99%

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Transient dispersion process of active particles

Jiang

Chen

2021

J. Fluid Mech.

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Active particles often swim in confined environments. The transport mechanisms, especially the global one as reflected by the Taylor dispersion model, are of great practical interest to various applications. For the active dispersion process in confined flows, previous analytical studies focused on the long-time asymptotic values of dispersion characteristics. Only several numerical studies preliminarily investigated the temporal evolution. Extending recent studies of Jiang & Chen (J. Fluid Mech., vol. 877, 2019, pp. 1–34; vol. 899, 2020, A18), this work makes a semi-analytical attempt to investigate the transient process. The temporal evolution of the local distribution in the confined-section–orientation space, drift, dispersivity and skewness, is explored based on moments of distributions. We introduce the biorthogonal expansion method for solutions because the classic integral transform method for passive transport problems is not applicable due to the self-propulsion effect. Two types of boundary condition, the reflective condition and the Robin condition for wall accumulation, are imposed respectively. A detailed study on spherical and ellipsoidal swimmers dispersing in a plane Poiseuille flow demonstrates the influences of the swimming, shear flow, initial condition, wall accumulation and particle shape on the transient dispersion process. The swimming-induced diffusion makes the local distribution reach its equilibrium state faster than that of passive particles. Although the wall accumulation significantly affects the evolution of the local distribution and the drift, the time scale to reach the Taylor regime is not obviously changed. The shear-induced alignment of ellipsoidal particles can enlarge the dispersivity but impacts slightly on the drift and the skewness.

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Advection and dispersion induced by an interface between two immiscible fluids in a laminar flow

Dejam

2022

AIChE Journal

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We report novel transport phenomena arising from an interface between two immiscible liquids in a laminar flow. In the context of the Taylor–Aris dispersion theory, we provide a quantitative description and demonstrate that the planar interface between two liquids in a laminar flow can lead to uphill advection and dispersion, dispersion barrier, as well as osmotic dispersion. The developed understanding of the newly identified transport phenomena paves the way for further research in this area and enables the insightful elucidation of mixing and separation processes in multiphase systems.

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Upstream swimming and Taylor dispersion of active Brownian particles

Cited by 38 publications

References 61 publications

Tuning chemotactic and diffusiophoretic spreading via hydrodynamic flows

Tuning chemotactic and diffusiophoretic spreading via hydrodynamic flows

Transient dispersion process of active particles

Advection and dispersion induced by an interface between two immiscible fluids in a laminar flow

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