---
OA_type: closed access
_id: '20928'
abstract:
- lang: eng
text: The current work focuses on the performance of hydrodynamics and mass transfer
in a microchannel. A hydrodynamic model is developed for a gas–liquid (CO2–water)
system and slug flow pattern. For the first time in literature, a concept of pulsating
velocity input is introduced in an enhanced cross-T-junction microchannel to study
the mass transfer using the physical absorption mechanism in ANSYS FLUENT R2 2024.
The mass transfer model is associated with the hydrodynamic model and some user-defined
functions in FLUENT. This work demonstrates that incorporating obstructions and
applying trapezoidal and sinusoidal wave inputs improve the CO2 absorption rate.
The obtained data are further compared with the plain T-junction microchannel
in terms of mass transfer coefficient. Solubility of CO2 in three different solvents
(ethyl alcohol, water, and ethylene glycol) has been revealed in an enhanced cross
T-junction microchannel at two different temperatures, i.e., 298.15 and 303.15 K.
The numerical simulations illustrate that an increase in temperature has an adverse
effect on the mass transfer rate.
acknowledgement: The authors are thankful for the financial support provided by the
Ministry of Education, India, and MNNIT Allahabad, as well as for the necessary
equipment, computing facilities, and overall support to carry out this study.
article_number: '122012'
article_processing_charge: No
article_type: original
author:
- first_name: Bushra
full_name: Khatoon, Bushra
last_name: Khatoon
- first_name: Vikas K.
full_name: Chaudhary, Vikas K.
last_name: Chaudhary
- first_name: Shoaib
full_name: Kamil, Shoaib
id: 185a19af-dc7d-11ea-9b2f-8eb2201959e9
last_name: Kamil
- first_name: Shabih Ul
full_name: Hasan, Shabih Ul
last_name: Hasan
- first_name: M. Siraj
full_name: Alam, M. Siraj
last_name: Alam
citation:
ama: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. Enhanced mass transfer
in microgeometry using pulsating velocity inputs: Hydrodynamic analysis and numerical
simulation. Physics of Fluids. 2025;37(12). doi:10.1063/5.0303132'
apa: 'Khatoon, B., Chaudhary, V. K., Kamil, S., Hasan, S. U., & Alam, M. S.
(2025). Enhanced mass transfer in microgeometry using pulsating velocity inputs:
Hydrodynamic analysis and numerical simulation. Physics of Fluids. AIP
Publishing. https://doi.org/10.1063/5.0303132'
chicago: 'Khatoon, Bushra, Vikas K. Chaudhary, Shoaib Kamil, Shabih Ul Hasan, and
M. Siraj Alam. “Enhanced Mass Transfer in Microgeometry Using Pulsating Velocity
Inputs: Hydrodynamic Analysis and Numerical Simulation.” Physics of Fluids.
AIP Publishing, 2025. https://doi.org/10.1063/5.0303132.'
ieee: 'B. Khatoon, V. K. Chaudhary, S. Kamil, S. U. Hasan, and M. S. Alam, “Enhanced
mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
and numerical simulation,” Physics of Fluids, vol. 37, no. 12. AIP Publishing,
2025.'
ista: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. 2025. Enhanced mass
transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
and numerical simulation. Physics of Fluids. 37(12), 122012.'
mla: 'Khatoon, Bushra, et al. “Enhanced Mass Transfer in Microgeometry Using Pulsating
Velocity Inputs: Hydrodynamic Analysis and Numerical Simulation.” Physics of
Fluids, vol. 37, no. 12, 122012, AIP Publishing, 2025, doi:10.1063/5.0303132.'
short: B. Khatoon, V.K. Chaudhary, S. Kamil, S.U. Hasan, M.S. Alam, Physics of Fluids
37 (2025).
date_created: 2026-01-04T23:01:34Z
date_published: 2025-12-01T00:00:00Z
date_updated: 2026-01-05T10:54:15Z
day: '01'
department:
- _id: BjHo
doi: 10.1063/5.0303132
intvolume: ' 37'
issue: '12'
language:
- iso: eng
month: '12'
oa_version: None
publication: Physics of Fluids
publication_identifier:
eissn:
- 1089-7666
issn:
- 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Enhanced mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic
analysis and numerical simulation'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 37
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19670'
abstract:
- lang: eng
text: “Pasta alla Cacio e pepe” is a traditional Italian dish made with pasta, pecorino
cheese, and pepper. Despite its simple ingredient list, achieving the perfect
texture and creaminess of the sauce can be challenging. In this study, we systematically
explore the phase behavior of Cacio e pepe sauce, focusing on its stability at
increasing temperatures for various proportions of cheese, water, and starch.
We identify starch concentration as the key factor influencing sauce stability,
with direct implications for practical cooking. Specifically, we delineate a regime
where starch concentrations below 1% (relative to cheese mass) lead to the formation
of system-wide clumps, a condition determining what we term the “Mozzarella Phase”
and corresponding to an unpleasant and separated sauce. Additionally, we examine
the impact of cheese concentration relative to water at a fixed starch level,
observing a lower critical solution temperature that we theoretically rationalized
by means of a minimal effective free-energy model. We further analyze the effect
of a less traditional stabilizer, trisodium citrate, and observe a sharp transition
from the Mozzarella Phase to a completely smooth and stable sauce, in contrast
to starch-stabilized mixtures, where the transition is more gradual. Finally,
we present a scientifically optimized recipe based on our findings, enabling a
consistently flawless execution of this classic dish.
acknowledgement: he authors thank Frank Jülicher, for supporting the initiative and
stimulating discussions. We thank Tetsuya Spippayashi for enlightening clarifications
on the historical origins of Cacio e pepe and Giuseppe Ricchitelli for helping with
the construction of the experimental apparatus. We further thank Martina Gaiba,
Alessandro Gaiba, John D. Treado, Virginia Lepore, Eleonora Nanu, Julia Kirsch,
Lara Koehler, Burak Budanur, Irina Pi-Jaumà, Elizabeth Brückner, M.J. Franco Oñate,
Giorgio Nicoletti, and Marco Salvalaglio for their support and for eating up the
sample leftovers. Finally, we thank Simone Frau for taking the photograph in Fig.
1(a).
article_number: '044122'
article_processing_charge: Yes (in subscription journal)
article_type: original
arxiv: 1
author:
- first_name: G.
full_name: Bartolucci, G.
last_name: Bartolucci
- first_name: D. M.
full_name: Busiello, D. M.
last_name: Busiello
- first_name: M.
full_name: Ciarchi, M.
last_name: Ciarchi
- first_name: A.
full_name: Corticelli, A.
last_name: Corticelli
- first_name: I.
full_name: Di Terlizzi, I.
last_name: Di Terlizzi
- first_name: Fabrizio
full_name: Olmeda, Fabrizio
id: 69dbf5fb-8a76-11ed-866b-fb486d8b5689
last_name: Olmeda
- first_name: D.
full_name: Revignas, D.
last_name: Revignas
- first_name: V. M.
full_name: Schimmenti, V. M.
last_name: Schimmenti
citation:
ama: Bartolucci G, Busiello DM, Ciarchi M, et al. Phase behavior of Cacio e Pepe
sauce. Physics of Fluids. 2025;37(4). doi:10.1063/5.0255841
apa: Bartolucci, G., Busiello, D. M., Ciarchi, M., Corticelli, A., Di Terlizzi,
I., Olmeda, F., … Schimmenti, V. M. (2025). Phase behavior of Cacio e Pepe sauce.
Physics of Fluids. AIP Publishing. https://doi.org/10.1063/5.0255841
chicago: Bartolucci, G., D. M. Busiello, M. Ciarchi, A. Corticelli, I. Di Terlizzi,
Fabrizio Olmeda, D. Revignas, and V. M. Schimmenti. “Phase Behavior of Cacio e
Pepe Sauce.” Physics of Fluids. AIP Publishing, 2025. https://doi.org/10.1063/5.0255841.
ieee: G. Bartolucci et al., “Phase behavior of Cacio e Pepe sauce,” Physics
of Fluids, vol. 37, no. 4. AIP Publishing, 2025.
ista: Bartolucci G, Busiello DM, Ciarchi M, Corticelli A, Di Terlizzi I, Olmeda
F, Revignas D, Schimmenti VM. 2025. Phase behavior of Cacio e Pepe sauce. Physics
of Fluids. 37(4), 044122.
mla: Bartolucci, G., et al. “Phase Behavior of Cacio e Pepe Sauce.” Physics of
Fluids, vol. 37, no. 4, 044122, AIP Publishing, 2025, doi:10.1063/5.0255841.
short: G. Bartolucci, D.M. Busiello, M. Ciarchi, A. Corticelli, I. Di Terlizzi,
F. Olmeda, D. Revignas, V.M. Schimmenti, Physics of Fluids 37 (2025).
date_created: 2025-05-11T22:02:40Z
date_published: 2025-04-01T00:00:00Z
date_updated: 2026-04-28T13:24:53Z
day: '01'
ddc:
- '530'
department:
- _id: EdHa
doi: 10.1063/5.0255841
external_id:
arxiv:
- '2501.00536'
isi:
- '001482986200001'
file:
- access_level: open_access
checksum: 242d05898aa0a2348b9c108747adb5ce
content_type: application/pdf
creator: dernst
date_created: 2025-05-12T09:31:22Z
date_updated: 2025-05-12T09:31:22Z
file_id: '19681'
file_name: 2025_PhysicsFluids_Bartolucci.pdf
file_size: 4926853
relation: main_file
success: 1
file_date_updated: 2025-05-12T09:31:22Z
has_accepted_license: '1'
intvolume: ' 37'
isi: 1
issue: '4'
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
publication: Physics of Fluids
publication_identifier:
eissn:
- 1089-7666
issn:
- 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
related_material:
link:
- description: News on ISTA
relation: press_release
url: https://ista.ac.at/en/news/2025-ig-nobel-prize-for-perfect-pasta-sauce/
scopus_import: '1'
status: public
title: Phase behavior of Cacio e Pepe sauce
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: ba8df636-2132-11f1-aed0-ed93e2281fdd
volume: 37
year: '2025'
...
---
_id: '12146'
abstract:
- lang: eng
text: 'In this paper, we explore the stability and dynamical relevance of a wide
variety of steady, time-periodic, quasiperiodic, and chaotic flows arising between
orthogonally stretching parallel plates. We first explore the stability of all
the steady flow solution families formerly identified by Ayats et al. [“Flows
between orthogonally stretching parallel plates,” Phys. Fluids 33, 024103 (2021)],
concluding that only the one that originates from the Stokesian approximation
is actually stable. When both plates are shrinking at identical or nearly the
same deceleration rates, this Stokesian flow exhibits a Hopf bifurcation that
leads to stable time-periodic regimes. The resulting time-periodic orbits or flows
are tracked for different Reynolds numbers and stretching rates while monitoring
their Floquet exponents to identify secondary instabilities. It is found that
these time-periodic flows also exhibit Neimark–Sacker bifurcations, generating
stable quasiperiodic flows (tori) that may sometimes give rise to chaotic dynamics
through a Ruelle–Takens–Newhouse scenario. However, chaotic dynamics is unusually
observed, as the quasiperiodic flows generally become phase-locked through a resonance
mechanism before a strange attractor may arise, thus restoring the time-periodicity
of the flow. In this work, we have identified and tracked four different resonance
regions, also known as Arnold tongues or horns. In particular, the 1 : 4 strong
resonance region is explored in great detail, where the identified scenarios are
in very good agreement with normal form theory. '
acknowledgement: "This work was supported by the Spanish MINECO under Grant Nos. FIS2017-85794-P
and PRX18/00179, the Spanish MICINN through Grant No. PID2020-114043GB-I00, and
the\r\nGeneralitat de Catalunya under Grant No. 2017-SGR-785. B.W.’s research was
also supported by the Chinese Scholarship Council through Grant CSC No. 201806440152."
article_number: '114111'
article_processing_charge: No
article_type: original
author:
- first_name: B.
full_name: Wang, B.
last_name: Wang
- 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: A.
full_name: Meseguer, A.
last_name: Meseguer
- first_name: F.
full_name: Marques, F.
last_name: Marques
citation:
ama: Wang B, Ayats López R, Meseguer A, Marques F. Phase-locking flows between orthogonally
stretching parallel plates. Physics of Fluids. 2022;34(11). doi:10.1063/5.0124152
apa: Wang, B., Ayats López, R., Meseguer, A., & Marques, F. (2022). Phase-locking
flows between orthogonally stretching parallel plates. Physics of Fluids.
AIP Publishing. https://doi.org/10.1063/5.0124152
chicago: Wang, B., Roger Ayats López, A. Meseguer, and F. Marques. “Phase-Locking
Flows between Orthogonally Stretching Parallel Plates.” Physics of Fluids.
AIP Publishing, 2022. https://doi.org/10.1063/5.0124152.
ieee: B. Wang, R. Ayats López, A. Meseguer, and F. Marques, “Phase-locking flows
between orthogonally stretching parallel plates,” Physics of Fluids, vol.
34, no. 11. AIP Publishing, 2022.
ista: Wang B, Ayats López R, Meseguer A, Marques F. 2022. Phase-locking flows between
orthogonally stretching parallel plates. Physics of Fluids. 34(11), 114111.
mla: Wang, B., et al. “Phase-Locking Flows between Orthogonally Stretching Parallel
Plates.” Physics of Fluids, vol. 34, no. 11, 114111, AIP Publishing, 2022,
doi:10.1063/5.0124152.
short: B. Wang, R. Ayats López, A. Meseguer, F. Marques, Physics of Fluids 34 (2022).
date_created: 2023-01-12T12:06:58Z
date_published: 2022-11-04T00:00:00Z
date_updated: 2023-10-03T11:07:58Z
day: '04'
department:
- _id: BjHo
doi: 10.1063/5.0124152
external_id:
isi:
- '000880665300024'
intvolume: ' 34'
isi: 1
issue: '11'
keyword:
- Condensed Matter Physics
- Fluid Flow and Transfer Processes
- Mechanics of Materials
- Computational Mechanics
- Mechanical Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://upcommons.upc.edu/handle/2117/385635
month: '11'
oa: 1
oa_version: Submitted Version
publication: Physics of Fluids
publication_identifier:
eissn:
- 1089-7666
issn:
- 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Phase-locking flows between orthogonally stretching parallel plates
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 34
year: '2022'
...