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Bulk Acoustic Wave Activated Droplet Generation and Isolation

Hemachandran, E. ; Laurell, T. LU and Sen, A. K. (2023) 48th National Conference on Fluid Mechanics and Fluid Power, FMFP 2021 In Lecture Notes in Mechanical Engineering p.145-150
Abstract

On-demand droplet generation from a continuously flowing stream of aqueous phase has profound applications in dropletbased microfluidics for rare event encapsulation studies. Here, we present acoustic relocation-based droplet generation from co-flowing immiscible fluids in an on-demand manner using bulk acoustic wave (BAW). After on-demand droplet generation, droplets are isolated using the same acoustic force resulted from BAW. Two different acoustic relocation regimes are observed, namely, stream to droplet relocation and stream to stream relocation regime. Our experimental observation reveals that to generate droplets from co-flowing fluids, the following conditions must be satisfied. First, the co-flowing immiscible stream should be... (More)

On-demand droplet generation from a continuously flowing stream of aqueous phase has profound applications in dropletbased microfluidics for rare event encapsulation studies. Here, we present acoustic relocation-based droplet generation from co-flowing immiscible fluids in an on-demand manner using bulk acoustic wave (BAW). After on-demand droplet generation, droplets are isolated using the same acoustic force resulted from BAW. Two different acoustic relocation regimes are observed, namely, stream to droplet relocation and stream to stream relocation regime. Our experimental observation reveals that to generate droplets from co-flowing fluids, the following conditions must be satisfied. First, the co-flowing immiscible stream should be maintained in acoustic relocation conditions (Cac > 1); Second, the capillary instability should be triggered during the relocation process, which happens at capillary numbers of the co-flowing fluids should be less than 0.2 (CaL and CaH < 0.2). Finally, using BAW microfluidic chip, droplets containing microparticle were produced ondemand from co-flowing streams wherein the microparticles are added in one of the phases.

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Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Acoustic relocation, Bulk acoustic wave, Capillary instability, Co-flow, Encapsulation, On-demand droplet
host publication
Fluid Mechanics and Fluid Power (Vol. 3)- Select Proceedings of FMFP 2021
series title
Lecture Notes in Mechanical Engineering
editor
Bhattacharyya, Suvanjan ; Verma, Saket and Harikrishnan, A.R.
pages
6 pages
publisher
Springer Science and Business Media B.V.
conference name
48th National Conference on Fluid Mechanics and Fluid Power, FMFP 2021
conference location
Pilani, India
conference dates
2021-12-27 - 2021-12-29
external identifiers
  • scopus:85161508186
ISSN
2195-4364
2195-4356
ISBN
9789811962691
DOI
10.1007/978-981-19-6270-7_26
language
English
LU publication?
yes
id
25e79170-a5b0-4ca7-bb33-735d276ea2a8
date added to LUP
2023-08-23 12:29:50
date last changed
2024-04-20 01:21:08
@inproceedings{25e79170-a5b0-4ca7-bb33-735d276ea2a8,
  abstract     = {{<p>On-demand droplet generation from a continuously flowing stream of aqueous phase has profound applications in dropletbased microfluidics for rare event encapsulation studies. Here, we present acoustic relocation-based droplet generation from co-flowing immiscible fluids in an on-demand manner using bulk acoustic wave (BAW). After on-demand droplet generation, droplets are isolated using the same acoustic force resulted from BAW. Two different acoustic relocation regimes are observed, namely, stream to droplet relocation and stream to stream relocation regime. Our experimental observation reveals that to generate droplets from co-flowing fluids, the following conditions must be satisfied. First, the co-flowing immiscible stream should be maintained in acoustic relocation conditions (C<sub>ac</sub> &amp;gt; 1); Second, the capillary instability should be triggered during the relocation process, which happens at capillary numbers of the co-flowing fluids should be less than 0.2 (Ca<sub>L</sub> and Ca<sub>H</sub> &amp;lt; 0.2). Finally, using BAW microfluidic chip, droplets containing microparticle were produced ondemand from co-flowing streams wherein the microparticles are added in one of the phases.</p>}},
  author       = {{Hemachandran, E. and Laurell, T. and Sen, A. K.}},
  booktitle    = {{Fluid Mechanics and Fluid Power (Vol. 3)- Select Proceedings of FMFP 2021}},
  editor       = {{Bhattacharyya, Suvanjan and Verma, Saket and Harikrishnan, A.R.}},
  isbn         = {{9789811962691}},
  issn         = {{2195-4364}},
  keywords     = {{Acoustic relocation; Bulk acoustic wave; Capillary instability; Co-flow; Encapsulation; On-demand droplet}},
  language     = {{eng}},
  pages        = {{145--150}},
  publisher    = {{Springer Science and Business Media B.V.}},
  series       = {{Lecture Notes in Mechanical Engineering}},
  title        = {{Bulk Acoustic Wave Activated Droplet Generation and Isolation}},
  url          = {{http://dx.doi.org/10.1007/978-981-19-6270-7_26}},
  doi          = {{10.1007/978-981-19-6270-7_26}},
  year         = {{2023}},
}