Reversible Stream Drop Transition in a Microfluidic Coflow System via on Demand Exposure to Acoustic Standing Waves
(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].
(Less)
- author
- Hemachandran, E. ; Hoque, S. Z. ; Laurell, T. LU and Sen, A. K.
- organization
- publishing date
- 2021-09-24
- 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
- additional info
- 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
- 2024-09-08 02:12:08
@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}}, }