---
_id: '15045'
abstract:
- lang: eng
text: Coupling of orbital motion to a spin degree of freedom gives rise to various
transport phenomena in quantum systems that are beyond the standard paradigms
of classical physics. Here, we discuss features of spin-orbit dynamics that can
be visualized using a classical model with two coupled angular degrees of freedom.
Specifically, we demonstrate classical ‘spin’ filtering through our model and
show that the interplay between angular degrees of freedom and dissipation can
lead to asymmetric ‘spin’ transport.
acknowledgement: "We thank Mikhail Lemeshko and members of his group for many inspiring
discussions; Alberto Cappellaro for comments on the manuscript.\r\nOpen access funding
provided by Institute of Science and Technology (IST Austria)."
article_number: '12'
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Areg
full_name: Ghazaryan, Areg
id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
last_name: Ghazaryan
orcid: 0000-0001-9666-3543
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
citation:
ama: Varshney A, Ghazaryan A, Volosniev A. Classical ‘spin’ filtering with two degrees
of freedom and dissipation. Few-Body Systems. 2024;65. doi:10.1007/s00601-024-01880-x
apa: Varshney, A., Ghazaryan, A., & Volosniev, A. (2024). Classical ‘spin’ filtering
with two degrees of freedom and dissipation. Few-Body Systems. Springer
Nature. https://doi.org/10.1007/s00601-024-01880-x
chicago: Varshney, Atul, Areg Ghazaryan, and Artem Volosniev. “Classical ‘Spin’
Filtering with Two Degrees of Freedom and Dissipation.” Few-Body Systems.
Springer Nature, 2024. https://doi.org/10.1007/s00601-024-01880-x.
ieee: A. Varshney, A. Ghazaryan, and A. Volosniev, “Classical ‘spin’ filtering with
two degrees of freedom and dissipation,” Few-Body Systems, vol. 65. Springer
Nature, 2024.
ista: Varshney A, Ghazaryan A, Volosniev A. 2024. Classical ‘spin’ filtering with
two degrees of freedom and dissipation. Few-Body Systems. 65, 12.
mla: Varshney, Atul, et al. “Classical ‘Spin’ Filtering with Two Degrees of Freedom
and Dissipation.” Few-Body Systems, vol. 65, 12, Springer Nature, 2024,
doi:10.1007/s00601-024-01880-x.
short: A. Varshney, A. Ghazaryan, A. Volosniev, Few-Body Systems 65 (2024).
date_created: 2024-03-01T11:39:33Z
date_published: 2024-02-17T00:00:00Z
date_updated: 2024-03-04T07:08:16Z
day: '17'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1007/s00601-024-01880-x
external_id:
arxiv:
- '2401.08454'
file:
- access_level: open_access
checksum: c4e08cc7bc756da69b1b36fda7bb92fb
content_type: application/pdf
creator: dernst
date_created: 2024-03-04T07:07:10Z
date_updated: 2024-03-04T07:07:10Z
file_id: '15049'
file_name: 2024_FewBodySys_Varshney.pdf
file_size: 436712
relation: main_file
success: 1
file_date_updated: 2024-03-04T07:07:10Z
has_accepted_license: '1'
intvolume: ' 65'
keyword:
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
publication: Few-Body Systems
publication_identifier:
issn:
- 1432-5411
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Classical ‘spin’ filtering with two degrees of freedom and dissipation
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: 65
year: '2024'
...
---
_id: '14341'
abstract:
- lang: eng
text: Flows through pipes and channels are, in practice, almost always turbulent,
and the multiscale eddying motion is responsible for a major part of the encountered
friction losses and pumping costs1. Conversely, for pulsatile flows, in particular
for aortic blood flow, turbulence levels remain low despite relatively large peak
velocities. For aortic blood flow, high turbulence levels are intolerable as they
would damage the shear-sensitive endothelial cell layer2,3,4,5. Here we show that
turbulence in ordinary pipe flow is diminished if the flow is driven in a pulsatile
mode that incorporates all the key features of the cardiac waveform. At Reynolds
numbers comparable to those of aortic blood flow, turbulence is largely inhibited,
whereas at much higher speeds, the turbulent drag is reduced by more than 25%.
This specific operation mode is more efficient when compared with steady driving,
which is the present situation for virtually all fluid transport processes ranging
from heating circuits to water, gas and oil pipelines.
acknowledged_ssus:
- _id: M-Shop
- _id: ScienComp
acknowledgement: We acknowledge the assistance of the Miba machine shop and the team
of the ISTA-HPC cluster. We thank M. Quadrio for the discussions. The work was supported
by the Simons Foundation (grant no. 662960) and by the Austrian Science Fund (grant
no. I4188-N30), within Deutsche Forschungsgemeinschaft research unit FOR 2688.
article_processing_charge: No
article_type: original
author:
- first_name: Davide
full_name: Scarselli, Davide
id: 40315C30-F248-11E8-B48F-1D18A9856A87
last_name: Scarselli
orcid: 0000-0001-5227-4271
- first_name: Jose M
full_name: Lopez Alonso, Jose M
id: 40770848-F248-11E8-B48F-1D18A9856A87
last_name: Lopez Alonso
orcid: 0000-0002-0384-2022
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Scarselli D, Lopez Alonso JM, Varshney A, Hof B. Turbulence suppression by
cardiac-cycle-inspired driving of pipe flow. Nature. 2023;621(7977):71-74.
doi:10.1038/s41586-023-06399-5
apa: Scarselli, D., Lopez Alonso, J. M., Varshney, A., & Hof, B. (2023). Turbulence
suppression by cardiac-cycle-inspired driving of pipe flow. Nature. Springer
Nature. https://doi.org/10.1038/s41586-023-06399-5
chicago: Scarselli, Davide, Jose M Lopez Alonso, Atul Varshney, and Björn Hof. “Turbulence
Suppression by Cardiac-Cycle-Inspired Driving of Pipe Flow.” Nature. Springer
Nature, 2023. https://doi.org/10.1038/s41586-023-06399-5.
ieee: D. Scarselli, J. M. Lopez Alonso, A. Varshney, and B. Hof, “Turbulence suppression
by cardiac-cycle-inspired driving of pipe flow,” Nature, vol. 621, no.
7977. Springer Nature, pp. 71–74, 2023.
ista: Scarselli D, Lopez Alonso JM, Varshney A, Hof B. 2023. Turbulence suppression
by cardiac-cycle-inspired driving of pipe flow. Nature. 621(7977), 71–74.
mla: Scarselli, Davide, et al. “Turbulence Suppression by Cardiac-Cycle-Inspired
Driving of Pipe Flow.” Nature, vol. 621, no. 7977, Springer Nature, 2023,
pp. 71–74, doi:10.1038/s41586-023-06399-5.
short: D. Scarselli, J.M. Lopez Alonso, A. Varshney, B. Hof, Nature 621 (2023) 71–74.
date_created: 2023-09-17T22:01:09Z
date_published: 2023-09-07T00:00:00Z
date_updated: 2023-09-20T12:10:22Z
day: '07'
department:
- _id: BjHo
doi: 10.1038/s41586-023-06399-5
external_id:
pmid:
- '37673988'
intvolume: ' 621'
issue: '7977'
language:
- iso: eng
month: '09'
oa_version: None
page: 71-74
pmid: 1
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: 'Revisiting the Turbulence Problem Using Statistical Mechanics: Experimental
Studies on Transitional and Turbulent Flows'
- _id: 238B8092-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: I04188
name: Instabilities in pulsating pipe flow of Newtonian and complex fluids
publication: Nature
publication_identifier:
eissn:
- 1476-4687
issn:
- 0028-0836
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on ISTA website
relation: press_release
url: https://www.ista.ac.at/en/news/pumping-like-the-heart/
scopus_import: '1'
status: public
title: Turbulence suppression by cardiac-cycle-inspired driving of pipe flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 621
year: '2023'
...
---
_id: '12279'
abstract:
- lang: eng
text: We report frictional drag reduction and a complete flow relaminarization of
elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow past
an obstacle. We show that the intensity of the observed elastic waves and wall-normal
vorticity correlate well with the measured drag above the onset of ET. Moreover,
we find that the elastic wave frequency grows with the Weissenberg number, and
at sufficiently high frequency it causes a decay of the elastic waves, resulting
in ET attenuation and drag reduction. Thus, this allows us to substantiate a physical
mechanism, involving the interaction of elastic waves with wall-normal vorticity
fluctuations, leading to the drag reduction and relaminarization phenomena at
low Reynolds number.
acknowledgement: "We thank G. Falkovich for discussion and Guy Han for technical support.
We are grateful to N. Jha for his help in µPIV measurements. This work is partially
supported by the grants from\r\nIsrael Science Foundation (ISF; grant #882/15 and
grant #784/19) and Binational USA-Israel Foundation (BSF;grant #2016145). "
article_number: L081301
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: M. Vijay
full_name: Kumar, M. Vijay
last_name: Kumar
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Dongyang
full_name: Li, Dongyang
last_name: Li
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Kumar MV, Varshney A, Li D, Steinberg V. Relaminarization of elastic turbulence.
Physical Review Fluids. 2022;7(8). doi:10.1103/physrevfluids.7.l081301
apa: Kumar, M. V., Varshney, A., Li, D., & Steinberg, V. (2022). Relaminarization
of elastic turbulence. Physical Review Fluids. American Physical Society.
https://doi.org/10.1103/physrevfluids.7.l081301
chicago: Kumar, M. Vijay, Atul Varshney, Dongyang Li, and Victor Steinberg. “Relaminarization
of Elastic Turbulence.” Physical Review Fluids. American Physical Society,
2022. https://doi.org/10.1103/physrevfluids.7.l081301.
ieee: M. V. Kumar, A. Varshney, D. Li, and V. Steinberg, “Relaminarization of elastic
turbulence,” Physical Review Fluids, vol. 7, no. 8. American Physical Society,
2022.
ista: Kumar MV, Varshney A, Li D, Steinberg V. 2022. Relaminarization of elastic
turbulence. Physical Review Fluids. 7(8), L081301.
mla: Kumar, M. Vijay, et al. “Relaminarization of Elastic Turbulence.” Physical
Review Fluids, vol. 7, no. 8, L081301, American Physical Society, 2022, doi:10.1103/physrevfluids.7.l081301.
short: M.V. Kumar, A. Varshney, D. Li, V. Steinberg, Physical Review Fluids 7 (2022).
date_created: 2023-01-16T10:02:40Z
date_published: 2022-08-03T00:00:00Z
date_updated: 2023-08-04T10:26:40Z
day: '03'
department:
- _id: BjHo
doi: 10.1103/physrevfluids.7.l081301
external_id:
arxiv:
- '2205.12871'
isi:
- '000836397000001'
intvolume: ' 7'
isi: 1
issue: '8'
keyword:
- Fluid Flow and Transfer Processes
- Modeling and Simulation
- Computational Mechanics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2205.12871'
month: '08'
oa: 1
oa_version: Preprint
publication: Physical Review Fluids
publication_identifier:
issn:
- 2469-990X
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Relaminarization of elastic turbulence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 7
year: '2022'
...
---
_id: '10299'
abstract:
- lang: eng
text: Turbulence generally arises in shear flows if velocities and hence, inertial
forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit
disordered motion even at vanishing inertia. Intermediate between these cases,
a state of chaotic motion, “elastoinertial turbulence” (EIT), has been observed
in a narrow Reynolds number interval. We here determine the origin of EIT in experiments
and show that characteristic EIT structures can be detected across an unexpectedly
wide range of parameters. Close to onset, a pattern of chevron-shaped streaks
emerges in qualitative agreement with linear and weakly nonlinear theory. However,
in experiments, the dynamics remain weakly chaotic, and the instability can be
traced to far lower Reynolds numbers than permitted by theory. For increasing
inertia, the flow undergoes a transformation to a wall mode composed of inclined
near-wall streaks and shear layers. This mode persists to what is known as the
“maximum drag reduction limit,” and overall EIT is found to dominate viscoelastic
flows across more than three orders of magnitude in Reynolds number.
acknowledgement: We thank Y. Dubief, R. Kerswell, E. Marensi, V. Shankar, V. Steinberg,
and V. Terrapon for discussions and helpful comments. A.V. and B.H. acknowledge
funding from the Austrian Science Fund, grant I4188-N30, within the Deutsche Forschungsgemeinschaft
research unit FOR 2688.
article_number: e2102350118
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: George H
full_name: Choueiri, George H
id: 448BD5BC-F248-11E8-B48F-1D18A9856A87
last_name: Choueiri
- first_name: Jose M
full_name: Lopez Alonso, Jose M
id: 40770848-F248-11E8-B48F-1D18A9856A87
last_name: Lopez Alonso
orcid: 0000-0002-0384-2022
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Sarath
full_name: Sankar, Sarath
last_name: Sankar
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. Experimental observation
of the origin and structure of elastoinertial turbulence. Proceedings of the
National Academy of Sciences. 2021;118(45). doi:10.1073/pnas.2102350118
apa: Choueiri, G. H., Lopez Alonso, J. M., Varshney, A., Sankar, S., & Hof,
B. (2021). Experimental observation of the origin and structure of elastoinertial
turbulence. Proceedings of the National Academy of Sciences. National Academy
of Sciences. https://doi.org/10.1073/pnas.2102350118
chicago: Choueiri, George H, Jose M Lopez Alonso, Atul Varshney, Sarath Sankar,
and Björn Hof. “Experimental Observation of the Origin and Structure of Elastoinertial
Turbulence.” Proceedings of the National Academy of Sciences. National
Academy of Sciences, 2021. https://doi.org/10.1073/pnas.2102350118.
ieee: G. H. Choueiri, J. M. Lopez Alonso, A. Varshney, S. Sankar, and B. Hof, “Experimental
observation of the origin and structure of elastoinertial turbulence,” Proceedings
of the National Academy of Sciences, vol. 118, no. 45. National Academy of
Sciences, 2021.
ista: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. 2021. Experimental
observation of the origin and structure of elastoinertial turbulence. Proceedings
of the National Academy of Sciences. 118(45), e2102350118.
mla: Choueiri, George H., et al. “Experimental Observation of the Origin and Structure
of Elastoinertial Turbulence.” Proceedings of the National Academy of Sciences,
vol. 118, no. 45, e2102350118, National Academy of Sciences, 2021, doi:10.1073/pnas.2102350118.
short: G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings
of the National Academy of Sciences 118 (2021).
date_created: 2021-11-17T13:24:24Z
date_published: 2021-11-03T00:00:00Z
date_updated: 2023-08-14T11:50:10Z
day: '03'
department:
- _id: BjHo
doi: 10.1073/pnas.2102350118
external_id:
arxiv:
- '2103.00023'
isi:
- '000720926900019'
pmid:
- ' 34732570'
intvolume: ' 118'
isi: 1
issue: '45'
keyword:
- multidisciplinary
- elastoinertial turbulence
- viscoelastic flows
- elastic instability
- drag reduction
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2103.00023
month: '11'
oa: 1
oa_version: Preprint
pmid: 1
project:
- _id: 238B8092-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: I04188
name: Instabilities in pulsating pipe flow of Newtonian and complex fluids
publication: Proceedings of the National Academy of Sciences
publication_identifier:
eissn:
- 1091-6490
issn:
- 0027-8424
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Experimental observation of the origin and structure of elastoinertial turbulence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 118
year: '2021'
...
---
_id: '7932'
abstract:
- lang: eng
text: Pulsating flows through tubular geometries are laminar provided that velocities
are moderate. This in particular is also believed to apply to cardiovascular flows
where inertial forces are typically too low to sustain turbulence. On the other
hand, flow instabilities and fluctuating shear stresses are held responsible for
a variety of cardiovascular diseases. Here we report a nonlinear instability mechanism
for pulsating pipe flow that gives rise to bursts of turbulence at low flow rates.
Geometrical distortions of small, yet finite, amplitude are found to excite a
state consisting of helical vortices during flow deceleration. The resulting flow
pattern grows rapidly in magnitude, breaks down into turbulence, and eventually
returns to laminar when the flow accelerates. This scenario causes shear stress
fluctuations and flow reversal during each pulsation cycle. Such unsteady conditions
can adversely affect blood vessels and have been shown to promote inflammation
and dysfunction of the shear stress-sensitive endothelial cell layer.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Duo
full_name: Xu, Duo
id: 3454D55E-F248-11E8-B48F-1D18A9856A87
last_name: Xu
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Xingyu
full_name: Ma, Xingyu
id: 34BADBA6-F248-11E8-B48F-1D18A9856A87
last_name: Ma
orcid: 0000-0002-0179-9737
- first_name: Baofang
full_name: Song, Baofang
last_name: Song
- first_name: Michael
full_name: Riedl, Michael
id: 3BE60946-F248-11E8-B48F-1D18A9856A87
last_name: Riedl
orcid: 0000-0003-4844-6311
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Xu D, Varshney A, Ma X, et al. Nonlinear hydrodynamic instability and turbulence
in pulsatile flow. Proceedings of the National Academy of Sciences of the United
States of America. 2020;117(21):11233-11239. doi:10.1073/pnas.1913716117
apa: Xu, D., Varshney, A., Ma, X., Song, B., Riedl, M., Avila, M., & Hof, B.
(2020). Nonlinear hydrodynamic instability and turbulence in pulsatile flow. Proceedings
of the National Academy of Sciences of the United States of America. National
Academy of Sciences. https://doi.org/10.1073/pnas.1913716117
chicago: Xu, Duo, Atul Varshney, Xingyu Ma, Baofang Song, Michael Riedl, Marc Avila,
and Björn Hof. “Nonlinear Hydrodynamic Instability and Turbulence in Pulsatile
Flow.” Proceedings of the National Academy of Sciences of the United States
of America. National Academy of Sciences, 2020. https://doi.org/10.1073/pnas.1913716117.
ieee: D. Xu et al., “Nonlinear hydrodynamic instability and turbulence in
pulsatile flow,” Proceedings of the National Academy of Sciences of the United
States of America, vol. 117, no. 21. National Academy of Sciences, pp. 11233–11239,
2020.
ista: Xu D, Varshney A, Ma X, Song B, Riedl M, Avila M, Hof B. 2020. Nonlinear hydrodynamic
instability and turbulence in pulsatile flow. Proceedings of the National Academy
of Sciences of the United States of America. 117(21), 11233–11239.
mla: Xu, Duo, et al. “Nonlinear Hydrodynamic Instability and Turbulence in Pulsatile
Flow.” Proceedings of the National Academy of Sciences of the United States
of America, vol. 117, no. 21, National Academy of Sciences, 2020, pp. 11233–39,
doi:10.1073/pnas.1913716117.
short: D. Xu, A. Varshney, X. Ma, B. Song, M. Riedl, M. Avila, B. Hof, Proceedings
of the National Academy of Sciences of the United States of America 117 (2020)
11233–11239.
date_created: 2020-06-07T22:00:51Z
date_published: 2020-05-26T00:00:00Z
date_updated: 2023-11-30T10:55:13Z
day: '26'
department:
- _id: BjHo
doi: 10.1073/pnas.1913716117
ec_funded: 1
external_id:
arxiv:
- '2005.11190'
isi:
- '000536797100014'
intvolume: ' 117'
isi: 1
issue: '21'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2005.11190
month: '05'
oa: 1
oa_version: Preprint
page: 11233-11239
project:
- _id: 238B8092-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: I04188
name: Instabilities in pulsating pipe flow of Newtonian and complex fluids
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Proceedings of the National Academy of Sciences of the United States
of America
publication_identifier:
eissn:
- '10916490'
issn:
- '00278424'
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/blood-flows-more-turbulent-than-previously-expected/
record:
- id: '12726'
relation: dissertation_contains
status: public
- id: '14530'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Nonlinear hydrodynamic instability and turbulence in pulsatile flow
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 117
year: '2020'
...
---
_id: '6014'
abstract:
- lang: eng
text: Speed of sound waves in gases and liquids are governed by the compressibility
of the medium. There exists another type of non-dispersive wave where the wave
speed depends on stress instead of elasticity of the medium. A well-known example
is the Alfven wave, which propagates through plasma permeated by a magnetic field
with the speed determined by magnetic tension. An elastic analogue of Alfven waves
has been predicted in a flow of dilute polymer solution where the elastic stress
of the stretching polymers determines the elastic wave speed. Here we present
quantitative evidence of elastic Alfven waves in elastic turbulence of a viscoelastic
creeping flow between two obstacles in channel flow. The key finding in the experimental
proof is a nonlinear dependence of the elastic wave speed cel on the Weissenberg
number Wi, which deviates from predictions based on a model of linear polymer
elasticity.
article_number: '652'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Varshney A, Steinberg V. Elastic alfven waves in elastic turbulence. Nature
Communications. 2019;10. doi:10.1038/s41467-019-08551-0
apa: Varshney, A., & Steinberg, V. (2019). Elastic alfven waves in elastic turbulence.
Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-019-08551-0
chicago: Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic
Turbulence.” Nature Communications. Springer Nature, 2019. https://doi.org/10.1038/s41467-019-08551-0.
ieee: A. Varshney and V. Steinberg, “Elastic alfven waves in elastic turbulence,”
Nature Communications, vol. 10. Springer Nature, 2019.
ista: Varshney A, Steinberg V. 2019. Elastic alfven waves in elastic turbulence.
Nature Communications. 10, 652.
mla: Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic Turbulence.”
Nature Communications, vol. 10, 652, Springer Nature, 2019, doi:10.1038/s41467-019-08551-0.
short: A. Varshney, V. Steinberg, Nature Communications 10 (2019).
date_created: 2019-02-15T07:10:46Z
date_published: 2019-02-08T00:00:00Z
date_updated: 2023-09-08T11:39:54Z
day: '08'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1038/s41467-019-08551-0
ec_funded: 1
external_id:
arxiv:
- '1902.03763'
isi:
- '000458175300001'
file:
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checksum: d3acf07eaad95ec040d8e8565fc9ac37
content_type: application/pdf
creator: dernst
date_created: 2019-02-15T07:15:00Z
date_updated: 2020-07-14T12:47:17Z
file_id: '6015'
file_name: 2019_NatureComm_Varshney.pdf
file_size: 1331490
relation: main_file
file_date_updated: 2020-07-14T12:47:17Z
has_accepted_license: '1'
intvolume: ' 10'
isi: 1
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Nature Communications
publication_identifier:
issn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Elastic alfven waves in elastic turbulence
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 10
year: '2019'
...
---
_id: '6069'
abstract:
- lang: eng
text: Electron transport in two-dimensional conducting materials such as graphene,
with dominant electron–electron interaction, exhibits unusual vortex flow that
leads to a nonlocal current-field relation (negative resistance), distinct from
the classical Ohm’s law. The transport behavior of these materials is best described
by low Reynolds number hydrodynamics, where the constitutive pressure–speed relation
is Stoke’s law. Here we report evidence of such vortices observed in a viscous
flow of Newtonian fluid in a microfluidic device consisting of a rectangular cavity—analogous
to the electronic system. We extend our experimental observations to elliptic
cavities of different eccentricities, and validate them by numerically solving
bi-harmonic equation obtained for the viscous flow with no-slip boundary conditions.
We verify the existence of a predicted threshold at which vortices appear. Strikingly,
we find that a two-dimensional theoretical model captures the essential features
of three-dimensional Stokes flow in experiments.
article_number: '937'
article_processing_charge: No
author:
- first_name: Jonathan
full_name: Mayzel, Jonathan
last_name: Mayzel
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
citation:
ama: Mayzel J, Steinberg V, Varshney A. Stokes flow analogous to viscous electron
current in graphene. Nature Communications. 2019;10. doi:10.1038/s41467-019-08916-5
apa: Mayzel, J., Steinberg, V., & Varshney, A. (2019). Stokes flow analogous
to viscous electron current in graphene. Nature Communications. Springer
Nature. https://doi.org/10.1038/s41467-019-08916-5
chicago: Mayzel, Jonathan, Victor Steinberg, and Atul Varshney. “Stokes Flow Analogous
to Viscous Electron Current in Graphene.” Nature Communications. Springer
Nature, 2019. https://doi.org/10.1038/s41467-019-08916-5.
ieee: J. Mayzel, V. Steinberg, and A. Varshney, “Stokes flow analogous to viscous
electron current in graphene,” Nature Communications, vol. 10. Springer
Nature, 2019.
ista: Mayzel J, Steinberg V, Varshney A. 2019. Stokes flow analogous to viscous
electron current in graphene. Nature Communications. 10, 937.
mla: Mayzel, Jonathan, et al. “Stokes Flow Analogous to Viscous Electron Current
in Graphene.” Nature Communications, vol. 10, 937, Springer Nature, 2019,
doi:10.1038/s41467-019-08916-5.
short: J. Mayzel, V. Steinberg, A. Varshney, Nature Communications 10 (2019).
date_created: 2019-03-05T13:18:30Z
date_published: 2019-02-26T00:00:00Z
date_updated: 2023-09-08T11:39:02Z
day: '26'
ddc:
- '530'
- '532'
department:
- _id: BjHo
doi: 10.1038/s41467-019-08916-5
ec_funded: 1
external_id:
isi:
- '000459704600001'
file:
- access_level: open_access
checksum: 61192fc49e0d44907c2a4fe384e4b97f
content_type: application/pdf
creator: dernst
date_created: 2019-03-05T13:33:04Z
date_updated: 2020-07-14T12:47:18Z
file_id: '6070'
file_name: 2019_NatureComm_Mayzel.pdf
file_size: 2646391
relation: main_file
file_date_updated: 2020-07-14T12:47:18Z
has_accepted_license: '1'
intvolume: ' 10'
isi: 1
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Nature Communications
publication_identifier:
issn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Stokes flow analogous to viscous electron current in graphene
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 10
year: '2019'
...
---
_id: '17'
abstract:
- lang: eng
text: Creeping flow of polymeric fluid without inertia exhibits elastic instabilities
and elastic turbulence accompanied by drag enhancement due to elastic stress produced
by flow-stretched polymers. However, in inertia-dominated flow at high Re and
low fluid elasticity El, a reduction in turbulent frictional drag is caused by
an intricate competition between inertial and elastic stresses. Here we explore
the effect of inertia on the stability of viscoelastic flow in a broad range of
control parameters El and (Re,Wi). We present the stability diagram of observed
flow regimes in Wi-Re coordinates and find that the instabilities' onsets show
an unexpectedly nonmonotonic dependence on El. Further, three distinct regions
in the diagram are identified based on El. Strikingly, for high-elasticity fluids
we discover a complete relaminarization of flow at Reynolds number in the range
of 1 to 10, different from a well-known turbulent drag reduction. These counterintuitive
effects may be explained by a finite polymer extensibility and a suppression of
vorticity at high Wi. Our results call for further theoretical and numerical development
to uncover the role of inertial effect on elastic turbulence in a viscoelastic
flow.
article_number: '103302 '
article_processing_charge: No
author:
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Varshney A, Steinberg V. Drag enhancement and drag reduction in viscoelastic
flow. Physical Review Fluids. 2018;3(10). doi:10.1103/PhysRevFluids.3.103302
apa: Varshney, A., & Steinberg, V. (2018). Drag enhancement and drag reduction
in viscoelastic flow. Physical Review Fluids. American Physical Society.
https://doi.org/10.1103/PhysRevFluids.3.103302
chicago: Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction
in Viscoelastic Flow.” Physical Review Fluids. American Physical Society,
2018. https://doi.org/10.1103/PhysRevFluids.3.103302.
ieee: A. Varshney and V. Steinberg, “Drag enhancement and drag reduction in viscoelastic
flow,” Physical Review Fluids, vol. 3, no. 10. American Physical Society,
2018.
ista: Varshney A, Steinberg V. 2018. Drag enhancement and drag reduction in viscoelastic
flow. Physical Review Fluids. 3(10), 103302.
mla: Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction
in Viscoelastic Flow.” Physical Review Fluids, vol. 3, no. 10, 103302,
American Physical Society, 2018, doi:10.1103/PhysRevFluids.3.103302.
short: A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).
date_created: 2018-12-11T11:44:11Z
date_published: 2018-10-15T00:00:00Z
date_updated: 2023-09-11T12:59:28Z
day: '15'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1103/PhysRevFluids.3.103302
ec_funded: 1
external_id:
isi:
- '000447311500001'
file:
- access_level: open_access
checksum: e1445be33e8165114e96246275600750
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:10:14Z
date_updated: 2020-07-14T12:45:12Z
file_id: '4800'
file_name: IST-2018-1061-v1+1_PhysRevFluids.3.103302.pdf
file_size: 1409040
relation: main_file
file_date_updated: 2020-07-14T12:45:12Z
has_accepted_license: '1'
intvolume: ' 3'
isi: 1
issue: '10'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review Fluids
publication_status: published
publisher: American Physical Society
publist_id: '8038'
pubrep_id: '1061'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Drag enhancement and drag reduction in viscoelastic flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 3
year: '2018'
...
---
_id: '16'
abstract:
- lang: eng
text: We report quantitative evidence of mixing-layer elastic instability in a viscoelastic
fluid flow between two widely spaced obstacles hindering a channel flow at Re
1 and Wi 1. Two mixing layers with nonuniform shear velocity profiles are formed
in the region between the obstacles. The mixing-layer instability arises in the
vicinity of an inflection point on the shear velocity profile with a steep variation
in the elastic stress. The instability results in an intermittent appearance of
small vortices in the mixing layers and an amplification of spatiotemporal averaged
vorticity in the elastic turbulence regime. The latter is characterized through
scaling of friction factor with Wi and both pressure and velocity spectra. Furthermore,
the observations reported provide improved understanding of the stability of the
mixing layer in a viscoelastic fluid at large elasticity, i.e., Wi 1 and Re 1
and oppose the current view of suppression of vorticity solely by polymer additives.
acknowledgement: This work was partially supported by the Israel Science Foundation
(ISF; Grant No. 882/15) and the Binational USA-Israel Foundation (BSF; Grant No.
2016145).
article_number: '103303'
article_processing_charge: No
article_type: original
author:
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Varshney A, Steinberg V. Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow. Physical Review Fluids. 2018;3(10). doi:10.1103/PhysRevFluids.3.103303
apa: Varshney, A., & Steinberg, V. (2018). Mixing layer instability and vorticity
amplification in a creeping viscoelastic flow. Physical Review Fluids.
American Physical Society. https://doi.org/10.1103/PhysRevFluids.3.103303
chicago: Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity
Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids.
American Physical Society, 2018. https://doi.org/10.1103/PhysRevFluids.3.103303.
ieee: A. Varshney and V. Steinberg, “Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow,” Physical Review Fluids, vol. 3, no. 10.
American Physical Society, 2018.
ista: Varshney A, Steinberg V. 2018. Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow. Physical Review Fluids. 3(10), 103303.
mla: Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity
Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids,
vol. 3, no. 10, 103303, American Physical Society, 2018, doi:10.1103/PhysRevFluids.3.103303.
short: A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).
date_created: 2018-12-11T11:44:10Z
date_published: 2018-10-16T00:00:00Z
date_updated: 2023-09-13T08:57:05Z
day: '16'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1103/PhysRevFluids.3.103303
ec_funded: 1
external_id:
isi:
- '000447469200001'
file:
- access_level: open_access
checksum: 7fc0a2322214d1c04debef36d5bf2e8a
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:13:56Z
date_updated: 2020-07-14T12:45:04Z
file_id: '5043'
file_name: IST-2018-1062-v1+1_PhysRevFluids.3.103303.pdf
file_size: 1838431
relation: main_file
file_date_updated: 2020-07-14T12:45:04Z
has_accepted_license: '1'
intvolume: ' 3'
isi: 1
issue: '10'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Submitted Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review Fluids
publication_status: published
publisher: American Physical Society
publist_id: '8039'
pubrep_id: '1062'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mixing layer instability and vorticity amplification in a creeping viscoelastic
flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 3
year: '2018'
...