Directional clogging and phase separation for disk flow through periodic and diluted obstacle arrays

Reichhardt, C.

doi:10.1039/d0sm01714k

Cited by 13 publications

(9 citation statements)

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“…The clogging arises from the formation of bottlenecks and arches that build up over time and block the flow. This state is similar to the T = 0 clogging states studied previously for passive particles in periodic arrays [58,60,61], random arrays [62,63], and bottleneck systems [64,65], where the clogged state is associated with strongly heterogeneous particle density. We note that for smaller F D at these small values of l r , the activity is still large enough that the system forms a liquid rather than a clogged state, as we describe in Section V.…”

Section: Resultssupporting

confidence: 84%

“…For θ < 30 • , the thermally clogged state appears as shown earlier. The emergence of clogged states for certain driving directions and flowing states for other driving directions was also observed in T = 0 passive disk studies [60]. For l r = 0.175 in Fig.…”

Section: Varied Driving Anglessupporting

confidence: 68%

“…For driving along an incommensurate angle, there can be two distinct clogging phases. The first, which we call thermal clogging, is a low activity clogged state similar to the clogging studied in previous work for zero activity [58,59] and for the low activity regime of active matter on random substrates [60][61][62], where the active particles form a heterogeneous system-spanning cluster. The second is a high activity state called active clogging which is associated with motility induced phase separation.…”

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confidence: 54%

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Clogging, Dynamics and Reentrant Fluid for Active Matter on Periodic Substrates

Reichhardt,

Reichhardt

2021

Preprint

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We examine the collective states of run-and-tumble active matter disks driven over a periodic obstacle array. When the drive is applied along a symmetry direction of the array, we find a clogfree uniform liquid state for low activity, while at higher activity, the density becomes increasingly heterogeneous and an active clogged state emerges in which the mobility is strongly reduced. For driving along non-symmetry or incommensurate directions, there are two different clogging behaviors consisting of a drive dependent clogged state in the low activity thermal limit and a drive independent clogged state at high activity. These regimes are separated by a uniform flowing liquid at intermediate activity. There is a critical activity level above which the thermal clogged state does not occur, as well as an optimal activity level that maximizes the disk mobility. Thermal clogged states are dependent on the driving direction while active clogged states are not. In the low activity regime, diluting the obstacles produces a monotonic increase in the mobility; however, for large activities, the mobility is more robust against obstacle dilution. We also examine the velocity-force curves for driving along non-symmetry directions, and find that they are linear when the activity is low or intermediate, but become nonlinear at high activity and show behavior similar to that found for the plastic depinning of solids. At higher drives the active clustering is lost. For low activity we also find a reentrant fluid phase, where the system transitions from a high mobility fluid at low drives to a clogged state at higher drives and then back into another fluid phase at very high drives. We map the regions in which the thermally clogged, partially clogged, active uniform fluid, clustered fluid, active clogged, and directionally locked states occur as a function of disk density, drift force, and activity.

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Section: Resultssupporting

confidence: 84%

Section: Varied Driving Anglessupporting

confidence: 68%

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confidence: 54%

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Clogging, Dynamics and Reentrant Fluid for Active Matter on Periodic Substrates

Reichhardt,

Reichhardt

2021

Preprint

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“…For transport in out-ofequilibrium systems, even at small (and even zero) external driving, the frenetic contribution complements entropic considerations (as in the fluctuation-dissipation relation) to enter crucially in the current characteristic [1,2]. Examples where the response to external fields, temperature or chemical affinities show negative differential susceptibility include [3][4][5][6][7][8][9]. In the present paper we revisit the set up of [3,4] but for active particles as studied before e.g.…”

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confidence: 95%

Pushing run-and-tumble particles through a rugged channel

Bijnens¹,

Maes

2021

J. Stat. Mech.

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We analyze the case of run-and-tumble particles pushed through a rugged channel both in the continuum and on the lattice. The current characteristic is non-monotone in the external field with the appearance of a current and nontrivial density profile even at zero field for asymmetric obstacles. If an external field is exerted against the direction of that zero-field current, then the resulting current decreases with persistence at small field and increases with persistence at large field. Activity in terms of self-propulsion increases the maximal current and postpones dying. We give an effective theoretical description with wider validity. I. INTRODUCTIONA nonequilibrium system, be it transient or stationary driven, is very sensitive to time-symmetric constraints and obstacles. Kinetic constraints or disorder indeed influence relaxation, diffusion and transport even for independent particles. For transport in out-ofequilibrium systems, even at small (and even zero) external driving, the frenetic contribution complements entropic considerations (as in the fluctuation-dissipation relation) to enter crucially in the current characteristic [1,2]. Examples where the response to external fields, temperature or chemical affinities show negative differential susceptibility include [3][4][5][6][7][8][9]. In the present paper we revisit the set up of [3,4] but for active particles as studied before e.g. also in [10][11][12][13][14][15]: how does the current characteristic change as a function of the persistence?Active matter consists of self-propelled particles, characterized by a coupling between motion and an internal degree of freedom, quantified by persistence [16][17][18][19][20]. Their dynamics model bacteria-motion and nanomotors or active colloids for their locomotion, possibly showing collective effects such as flocking or phase separation [21][22][23][24][25][26]. Also individually they

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“…Local roughness and flow field variations between different pores in that case are left out when using single flow channels (Lazouskaya et al, 2011;Sun et al, 2018), capillary tubes, or in case of using limited number of pores or regular/periodic pore structure (Auset and Keller, 2006;Wang et al, 2011;Liu et al, 2019). Periodicity in porous media is known to lead to a dependency on the direction of the flow with respect to the periodicity of the medium (Nguyen et al, 2017;Reichhardt and Reichhardt, 2021).…”

Section: Introductionmentioning

confidence: 99%

Transport of Solutes and Colloids in Multi-Scale Porous Media Under Single and Multi-Phase Flow

Vries¹

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Microscopic Experiments and Pore-Scale Modeling Transport van opgeloste stoffen en colloïden onder enkel en meerfasestroming in poreuze media met meerdere schalen microscopische experimenten en poriënschaal modellering (met een samenvatting in het Nederlands) PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Universiteit Utrecht op gezag van de rector magnificus, prof.dr. H.R.B.M. Kummeling, ingevolge het besluit van het college voor promoties in het openbaar te verdedigen op vrijdag 17 december 2021 des middags te 2.15 uur door Enno Tijmen de Vries geboren op 2 juni 1992 te Wijk bij Duurstede

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Directional clogging and phase separation for disk flow through periodic and diluted obstacle arrays

Abstract: Disks flowing through a square obstacle array clog for incommensurate driving angles, forming either uniform or heterogeneous clogged states.

Cited by 13 publications

References 67 publications

Clogging, Dynamics and Reentrant Fluid for Active Matter on Periodic Substrates

Clogging, Dynamics and Reentrant Fluid for Active Matter on Periodic Substrates

Pushing run-and-tumble particles through a rugged channel

Transport of Solutes and Colloids in Multi-Scale Porous Media Under Single and Multi-Phase Flow

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