Helical Flow States in Active Nematics

Ryan Keogh; Santhan Chandragiri; Benjamin Loewe; Tapio Ala-Nissila; Sumesh Thampi; Tyler N. Shendruk

doi:10.1103/PhysRevE.106.L012602

Helical Flow States in Active Nematics

Ryan Keogh, Santhan Chandragiri, Benjamin Loewe, Tapio Ala-Nissila, Sumesh Thampi, Tyler N. Shendruk^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

Abstract

We show that confining extensile nematics in 3D channels leads to the emergence of two self-organized flow states with nonzero helicity. The first is a pair of braided anti-parallel streams - this double helix occurs when the activity is moderate, anchoring negligible and reduced temperature high. The second consists of axially aligned counter-rotating vortices - this grinder train arises between spontaneous axial streaming and the vortex lattice. These two unanticipated helical flow states illustrate the potential of active fluids to break symmetries and form complex but organized spatio-temporal structures in 3D fluidic devices.

Original language	English
Article number	L012602
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review E
Volume	106
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevE.106.L012602
Publication status	Published - 7 Jul 2022

Keywords / Materials (for Non-textual outputs)

cond-mat.soft

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10.1103/PhysRevE.106.L012602

mainAccepted author manuscript, 3.44 MBLicence: Creative Commons: Attribution (CC-BY)

https://arxiv.org/abs/2112.01393Licence: Creative Commons: Attribution (CC-BY)

[LC]2: 'Living' Colloidal Liquid Crystals
Shendruk, T. (Principal Investigator)
EU government bodies
1/08/20 → 30/11/24
Project: Research

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title = "Helical Flow States in Active Nematics",

abstract = " We show that confining extensile nematics in 3D channels leads to the emergence of two self-organized flow states with nonzero helicity. The first is a pair of braided anti-parallel streams - this double helix occurs when the activity is moderate, anchoring negligible and reduced temperature high. The second consists of axially aligned counter-rotating vortices - this grinder train arises between spontaneous axial streaming and the vortex lattice. These two unanticipated helical flow states illustrate the potential of active fluids to break symmetries and form complex but organized spatio-temporal structures in 3D fluidic devices. ",

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author = "Ryan Keogh and Santhan Chandragiri and Benjamin Loewe and Tapio Ala-Nissila and Sumesh Thampi and Shendruk, {Tyler N.}",

note = "4 pages, 4 figures, appendices Funding Information: We thank Kevin Stratford and Kristian Thijssen for invaluable help. This research has received funding (TNS) from the European Research Council under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 851196). S.P.T. acknowledges the support by the Department of Science and Technology, India, via Research Grant No. CRG/2018/000644. T.A.-N. has been supported in part by the Academy of Finland PolyDyna (No. 307806) and QFT Center of Excellence Program grant (No. 312298). Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

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doi = "10.1103/PhysRevE.106.L012602",

language = "English",

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AU - Keogh, Ryan

AU - Chandragiri, Santhan

AU - Loewe, Benjamin

AU - Ala-Nissila, Tapio

AU - Thampi, Sumesh

AU - Shendruk, Tyler N.

N1 - 4 pages, 4 figures, appendices Funding Information: We thank Kevin Stratford and Kristian Thijssen for invaluable help. This research has received funding (TNS) from the European Research Council under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 851196). S.P.T. acknowledges the support by the Department of Science and Technology, India, via Research Grant No. CRG/2018/000644. T.A.-N. has been supported in part by the Academy of Finland PolyDyna (No. 307806) and QFT Center of Excellence Program grant (No. 312298). Publisher Copyright: © 2022 American Physical Society.

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N2 - We show that confining extensile nematics in 3D channels leads to the emergence of two self-organized flow states with nonzero helicity. The first is a pair of braided anti-parallel streams - this double helix occurs when the activity is moderate, anchoring negligible and reduced temperature high. The second consists of axially aligned counter-rotating vortices - this grinder train arises between spontaneous axial streaming and the vortex lattice. These two unanticipated helical flow states illustrate the potential of active fluids to break symmetries and form complex but organized spatio-temporal structures in 3D fluidic devices.

AB - We show that confining extensile nematics in 3D channels leads to the emergence of two self-organized flow states with nonzero helicity. The first is a pair of braided anti-parallel streams - this double helix occurs when the activity is moderate, anchoring negligible and reduced temperature high. The second consists of axially aligned counter-rotating vortices - this grinder train arises between spontaneous axial streaming and the vortex lattice. These two unanticipated helical flow states illustrate the potential of active fluids to break symmetries and form complex but organized spatio-temporal structures in 3D fluidic devices.

KW - cond-mat.soft

U2 - 10.1103/PhysRevE.106.L012602

DO - 10.1103/PhysRevE.106.L012602

M3 - Letter

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EP - 6

JO - Physical Review E

JF - Physical Review E

IS - 1

M1 - L012602

ER -

Helical Flow States in Active Nematics

Abstract

Keywords / Materials (for Non-textual outputs)

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[LC]2: 'Living' Colloidal Liquid Crystals

Cite this