---
_id: '14754'
abstract:
- lang: eng
  text: The large-scale laminar/turbulent spiral patterns that appear in the linearly
    unstable regime of counter-rotating Taylor–Couette flow are investigated from
    a statistical perspective by means of direct numerical simulation. Unlike the
    vast majority of previous numerical studies, we analyse the flow in periodic parallelogram-annular
    domains, following a coordinate change that aligns one of the parallelogram sides
    with the spiral pattern. The domain size, shape and spatial resolution have been
    varied and the results compared with those in a sufficiently large computational
    orthogonal domain with natural axial and azimuthal periodicity. We find that a
    minimal parallelogram of the right tilt significantly reduces the computational
    cost without notably compromising the statistical properties of the supercritical
    turbulent spiral. Its mean structure, obtained from extremely long time integrations
    in a co-rotating reference frame using the method of slices, bears remarkable
    similarity with the turbulent stripes observed in plane Couette flow, the centrifugal
    instability playing only a secondary role.
acknowledgement: K.D.’s research was supported by Australian Research Council Discovery
  Early Career Researcher Award (DE170100171). B.W., R.A., F.M. and A.M. research
  was supported by the Spanish Ministerio de Economía y Competitividad (grant nos.
  FIS2016-77849-R and FIS2017-85794-P) and Ministerio de Ciencia e Innovación (grant
  no. PID2020-114043GB-I00) and the Generalitat de Catalunya (grant no. 2017-SGR-785).
  B.W.’s research was also supported by the Chinese Scholarship Council (grant CSC
  no. 201806440152). F.M. is a Serra-Húnter Fellow.
article_number: '0112'
article_processing_charge: No
article_type: original
author:
- first_name: B.
  full_name: Wang, B.
  last_name: Wang
- first_name: F.
  full_name: Mellibovsky, F.
  last_name: Mellibovsky
- first_name: Roger
  full_name: Ayats López, Roger
  id: ab77522d-073b-11ed-8aff-e71b39258362
  last_name: Ayats López
  orcid: 0000-0001-6572-0621
- first_name: K.
  full_name: Deguchi, K.
  last_name: Deguchi
- first_name: A.
  full_name: Meseguer, A.
  last_name: Meseguer
citation:
  ama: Wang B, Mellibovsky F, Ayats López R, Deguchi K, Meseguer A. Mean structure
    of the supercritical turbulent spiral in Taylor–Couette flow. <i>Philosophical
    Transactions of the Royal Society A</i>. 2023;381(2246). doi:<a href="https://doi.org/10.1098/rsta.2022.0112">10.1098/rsta.2022.0112</a>
  apa: Wang, B., Mellibovsky, F., Ayats López, R., Deguchi, K., &#38; Meseguer, A.
    (2023). Mean structure of the supercritical turbulent spiral in Taylor–Couette
    flow. <i>Philosophical Transactions of the Royal Society A</i>. The Royal Society.
    <a href="https://doi.org/10.1098/rsta.2022.0112">https://doi.org/10.1098/rsta.2022.0112</a>
  chicago: Wang, B., F. Mellibovsky, Roger Ayats López, K. Deguchi, and A. Meseguer.
    “Mean Structure of the Supercritical Turbulent Spiral in Taylor–Couette Flow.”
    <i>Philosophical Transactions of the Royal Society A</i>. The Royal Society, 2023.
    <a href="https://doi.org/10.1098/rsta.2022.0112">https://doi.org/10.1098/rsta.2022.0112</a>.
  ieee: B. Wang, F. Mellibovsky, R. Ayats López, K. Deguchi, and A. Meseguer, “Mean
    structure of the supercritical turbulent spiral in Taylor–Couette flow,” <i>Philosophical
    Transactions of the Royal Society A</i>, vol. 381, no. 2246. The Royal Society,
    2023.
  ista: Wang B, Mellibovsky F, Ayats López R, Deguchi K, Meseguer A. 2023. Mean structure
    of the supercritical turbulent spiral in Taylor–Couette flow. Philosophical Transactions
    of the Royal Society A. 381(2246), 0112.
  mla: Wang, B., et al. “Mean Structure of the Supercritical Turbulent Spiral in Taylor–Couette
    Flow.” <i>Philosophical Transactions of the Royal Society A</i>, vol. 381, no.
    2246, 0112, The Royal Society, 2023, doi:<a href="https://doi.org/10.1098/rsta.2022.0112">10.1098/rsta.2022.0112</a>.
  short: B. Wang, F. Mellibovsky, R. Ayats López, K. Deguchi, A. Meseguer, Philosophical
    Transactions of the Royal Society A 381 (2023).
date_created: 2024-01-08T13:11:45Z
date_published: 2023-05-01T00:00:00Z
date_updated: 2024-01-09T09:15:29Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1098/rsta.2022.0112
external_id:
  pmid:
  - '36907214'
file:
- access_level: open_access
  checksum: 1978d126c0ce2f47c22ac20107cc0106
  content_type: application/pdf
  creator: dernst
  date_created: 2024-01-09T09:13:53Z
  date_updated: 2024-01-09T09:13:53Z
  file_id: '14763'
  file_name: 2023_PhilTransactionsA_Wang_accepted.pdf
  file_size: 6421086
  relation: main_file
  success: 1
file_date_updated: 2024-01-09T09:13:53Z
has_accepted_license: '1'
intvolume: '       381'
issue: '2246'
keyword:
- General Physics and Astronomy
- General Engineering
- General Mathematics
language:
- iso: eng
month: '05'
oa: 1
oa_version: Submitted Version
pmid: 1
publication: Philosophical Transactions of the Royal Society A
publication_identifier:
  eissn:
  - 1471-2962
  issn:
  - 1364-503X
publication_status: published
publisher: The Royal Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mean structure of the supercritical turbulent spiral in Taylor–Couette flow
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 381
year: '2023'
...
---
_id: '9166'
abstract:
- lang: eng
  text: Light-activated self-propelled colloids are synthesized and their active motion
    is studied using optical microscopy. We propose a versatile route using different
    photoactive materials, and demonstrate a multiwavelength activation and propulsion.
    Thanks to the photoelectrochemical properties of two semiconductor materials (α-Fe2O3
    and TiO2), a light with an energy higher than the bandgap triggers the reaction
    of decomposition of hydrogen peroxide and produces a chemical cloud around the
    particle. It induces a phoretic attraction with neighbouring colloids as well
    as an osmotic self-propulsion of the particle on the substrate. We use these mechanisms
    to form colloidal cargos as well as self-propelled particles where the light-activated
    component is embedded into a dielectric sphere. The particles are self-propelled
    along a direction otherwise randomized by thermal fluctuations, and exhibit a
    persistent random walk. For sufficient surface density, the particles spontaneously
    form ‘living crystals’ which are mobile, break apart and reform. Steering the
    particle with an external magnetic field, we show that the formation of the dense
    phase results from the collisions heads-on of the particles. This effect is intrinsically
    non-equilibrium and a novel principle of organization for systems without detailed
    balance. Engineering families of particles self-propelled by different wavelength
    demonstrate a good understanding of both the physics and the chemistry behind
    the system and points to a general route for designing new families of self-propelled
    particles.
article_number: '20130372'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jérémie A
  full_name: Palacci, Jérémie A
  id: 8fb92548-2b22-11eb-b7c1-a3f0d08d7c7d
  last_name: Palacci
  orcid: 0000-0002-7253-9465
- first_name: S.
  full_name: Sacanna, S.
  last_name: Sacanna
- first_name: S.-H.
  full_name: Kim, S.-H.
  last_name: Kim
- first_name: G.-R.
  full_name: Yi, G.-R.
  last_name: Yi
- first_name: D. J.
  full_name: Pine, D. J.
  last_name: Pine
- first_name: P. M.
  full_name: Chaikin, P. M.
  last_name: Chaikin
citation:
  ama: 'Palacci JA, Sacanna S, Kim S-H, Yi G-R, Pine DJ, Chaikin PM. Light-activated
    self-propelled colloids. <i>Philosophical Transactions of the Royal Society A:
    Mathematical, Physical and Engineering Sciences</i>. 2014;372(2029). doi:<a href="https://doi.org/10.1098/rsta.2013.0372">10.1098/rsta.2013.0372</a>'
  apa: 'Palacci, J. A., Sacanna, S., Kim, S.-H., Yi, G.-R., Pine, D. J., &#38; Chaikin,
    P. M. (2014). Light-activated self-propelled colloids. <i>Philosophical Transactions
    of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>. The
    Royal Society. <a href="https://doi.org/10.1098/rsta.2013.0372">https://doi.org/10.1098/rsta.2013.0372</a>'
  chicago: 'Palacci, Jérémie A, S. Sacanna, S.-H. Kim, G.-R. Yi, D. J. Pine, and P.
    M. Chaikin. “Light-Activated Self-Propelled Colloids.” <i>Philosophical Transactions
    of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>. The
    Royal Society, 2014. <a href="https://doi.org/10.1098/rsta.2013.0372">https://doi.org/10.1098/rsta.2013.0372</a>.'
  ieee: 'J. A. Palacci, S. Sacanna, S.-H. Kim, G.-R. Yi, D. J. Pine, and P. M. Chaikin,
    “Light-activated self-propelled colloids,” <i>Philosophical Transactions of the
    Royal Society A: Mathematical, Physical and Engineering Sciences</i>, vol. 372,
    no. 2029. The Royal Society, 2014.'
  ista: 'Palacci JA, Sacanna S, Kim S-H, Yi G-R, Pine DJ, Chaikin PM. 2014. Light-activated
    self-propelled colloids. Philosophical Transactions of the Royal Society A: Mathematical,
    Physical and Engineering Sciences. 372(2029), 20130372.'
  mla: 'Palacci, Jérémie A., et al. “Light-Activated Self-Propelled Colloids.” <i>Philosophical
    Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>,
    vol. 372, no. 2029, 20130372, The Royal Society, 2014, doi:<a href="https://doi.org/10.1098/rsta.2013.0372">10.1098/rsta.2013.0372</a>.'
  short: 'J.A. Palacci, S. Sacanna, S.-H. Kim, G.-R. Yi, D.J. Pine, P.M. Chaikin,
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and
    Engineering Sciences 372 (2014).'
date_created: 2021-02-18T14:31:11Z
date_published: 2014-11-28T00:00:00Z
date_updated: 2021-02-22T10:44:16Z
day: '28'
doi: 10.1098/rsta.2013.0372
extern: '1'
external_id:
  arxiv:
  - '1410.7278'
  pmid:
  - '25332383'
intvolume: '       372'
issue: '2029'
keyword:
- General Engineering
- General Physics and Astronomy
- General Mathematics
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1098/rsta.2013.0372
month: '11'
oa: 1
oa_version: Published Version
pmid: 1
publication: 'Philosophical Transactions of the Royal Society A: Mathematical, Physical
  and Engineering Sciences'
publication_identifier:
  eissn:
  - 1471-2962
  issn:
  - 1364-503X
publication_status: published
publisher: The Royal Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Light-activated self-propelled colloids
type: journal_article
user_id: D865714E-FA4E-11E9-B85B-F5C5E5697425
volume: 372
year: '2014'
...