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Reversible Stream Drop Transition in a Microfluidic Coflow System via on Demand Exposure to Acoustic Standing Waves

Hemachandran, E. ; Hoque, S. Z. ; Laurell, T. LU and Sen, A. K. (2021) In Physical Review Letters 127(13).
Abstract

Transition between stream and droplet regimes in a coflow is typically achieved by adjusting the capillary numbers (Ca) of the phases. Remarkably, we experimentally evidence a reversible transition between the two regimes by controlling exposure of the system to acoustic standing waves, with Ca fixed. By satisfying the ratio of acoustic radiation force to the interfacial tension force, , experiments reveal a reversible stream drop transition for , and stream relocation for . We explain the phenomenon in terms of the pinching, advection, and relocation timescales and a transition between convective and absolute instability from a linear stability analysis [P. Guillot, Phys. Rev. Lett.99, 104502... (More)

Transition between stream and droplet regimes in a coflow is typically achieved by adjusting the capillary numbers (Ca) of the phases. Remarkably, we experimentally evidence a reversible transition between the two regimes by controlling exposure of the system to acoustic standing waves, with Ca fixed. By satisfying the ratio of acoustic radiation force to the interfacial tension force, , experiments reveal a reversible stream drop transition for , and stream relocation for . We explain the phenomenon in terms of the pinching, advection, and relocation timescales and a transition between convective and absolute instability from a linear stability analysis [P. Guillot, Phys. Rev. Lett.99, 104502 (2007)PRLTAO0031-900710.1103/PhysRevLett.99.104502].

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; ; and
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publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
127
issue
13
article number
134501
publisher
American Physical Society
external identifiers
  • pmid:34623851
  • scopus:85115894114
ISSN
0031-9007
DOI
10.1103/PhysRevLett.127.134501
language
English
LU publication?
yes
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Publisher Copyright: © 2021 American Physical Society
id
11bc4e1a-78ef-4067-8494-7c5a1a34ed73
date added to LUP
2021-10-14 12:52:41
date last changed
2024-06-29 19:15:12
@article{11bc4e1a-78ef-4067-8494-7c5a1a34ed73,
  abstract     = {{<p>Transition between stream and droplet regimes in a coflow is typically achieved by adjusting the capillary numbers (Ca) of the phases. Remarkably, we experimentally evidence a reversible transition between the two regimes by controlling exposure of the system to acoustic standing waves, with Ca fixed. By satisfying the ratio of acoustic radiation force to the interfacial tension force, , experiments reveal a reversible stream drop transition for , and stream relocation for . We explain the phenomenon in terms of the pinching, advection, and relocation timescales and a transition between convective and absolute instability from a linear stability analysis [P. Guillot, Phys. Rev. Lett.99, 104502 (2007)PRLTAO0031-900710.1103/PhysRevLett.99.104502].</p>}},
  author       = {{Hemachandran, E. and Hoque, S. Z. and Laurell, T. and Sen, A. K.}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{13}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Reversible Stream Drop Transition in a Microfluidic Coflow System via on Demand Exposure to Acoustic Standing Waves}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.127.134501}},
  doi          = {{10.1103/PhysRevLett.127.134501}},
  volume       = {{127}},
  year         = {{2021}},
}