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Breakup dynamics of low-density gas and liquid interface during Taylor bubble formation in a microchannel flow-focusing device

Li, Xingchen LU ; Huang, Yiyong ; Chen, Xiaoqian and Wu, Zan LU (2020) In Chemical Engineering Science 215.
Abstract

This work aims to investigate the breakup dynamics of the low-density gas and liquid interface during bubble formation in a microchannel flow-focusing device. A high-contrast interface tracking method is developed. After the neck motion analysis in radial and axial directions, the time domain criterion between the liquid squeezing stage and the free pinch-off stage is proved to be two orders of magnitude less than the capillary time and is close to the viscous time of the liquid. Comparing to Nitrogen bubbles, the pinch-off point of Helium bubbles deflects downstream in viscous liquids and upstream in low surface tension liquids. Helium bubbles generate faster in viscous liquids and slower in low surface tension liquids. The power law... (More)

This work aims to investigate the breakup dynamics of the low-density gas and liquid interface during bubble formation in a microchannel flow-focusing device. A high-contrast interface tracking method is developed. After the neck motion analysis in radial and axial directions, the time domain criterion between the liquid squeezing stage and the free pinch-off stage is proved to be two orders of magnitude less than the capillary time and is close to the viscous time of the liquid. Comparing to Nitrogen bubbles, the pinch-off point of Helium bubbles deflects downstream in viscous liquids and upstream in low surface tension liquids. Helium bubbles generate faster in viscous liquids and slower in low surface tension liquids. The power law exponents of thread diameter to the pinch-off remaining time in Helium experiments, which are larger than those in Nitrogen experiments, agree with previous studies in both ranges (1/3–1/2) and tendency.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Confinement, Low-density gas, Microfluidics, Multiphase flow, Nonlinear dynamics, Pinch-off
in
Chemical Engineering Science
volume
215
article number
115473
publisher
Elsevier
external identifiers
  • scopus:85078243035
ISSN
0009-2509
DOI
10.1016/j.ces.2020.115473
language
English
LU publication?
yes
id
b9e3b179-7aa9-4740-9037-a7c11cdae9a4
date added to LUP
2020-02-04 10:52:09
date last changed
2023-11-19 22:20:37
@article{b9e3b179-7aa9-4740-9037-a7c11cdae9a4,
  abstract     = {{<p>This work aims to investigate the breakup dynamics of the low-density gas and liquid interface during bubble formation in a microchannel flow-focusing device. A high-contrast interface tracking method is developed. After the neck motion analysis in radial and axial directions, the time domain criterion between the liquid squeezing stage and the free pinch-off stage is proved to be two orders of magnitude less than the capillary time and is close to the viscous time of the liquid. Comparing to Nitrogen bubbles, the pinch-off point of Helium bubbles deflects downstream in viscous liquids and upstream in low surface tension liquids. Helium bubbles generate faster in viscous liquids and slower in low surface tension liquids. The power law exponents of thread diameter to the pinch-off remaining time in Helium experiments, which are larger than those in Nitrogen experiments, agree with previous studies in both ranges (1/3–1/2) and tendency.</p>}},
  author       = {{Li, Xingchen and Huang, Yiyong and Chen, Xiaoqian and Wu, Zan}},
  issn         = {{0009-2509}},
  keywords     = {{Confinement; Low-density gas; Microfluidics; Multiphase flow; Nonlinear dynamics; Pinch-off}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Elsevier}},
  series       = {{Chemical Engineering Science}},
  title        = {{Breakup dynamics of low-density gas and liquid interface during Taylor bubble formation in a microchannel flow-focusing device}},
  url          = {{http://dx.doi.org/10.1016/j.ces.2020.115473}},
  doi          = {{10.1016/j.ces.2020.115473}},
  volume       = {{215}},
  year         = {{2020}},
}