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Analysis on breakup dynamics of hydrogen taylor bubble formation in a cross-junction microchannel

Li, Xingchen LU ; Wu, Zan LU and Chen, Xiaoqian (2021) In International Journal of Hydrogen Energy 46(67). p.33438-33452
Abstract

The pinch-off dynamics during hydrogen bubble formation was experimentally investigated in a cross-junction microchannel. A binarization interface recognizing and key frame tracking method was established. By analyzing the breakup dynamics through spatial and time domains, the effects of interfacial tension and viscosity on hydrogen bubble pinch-off were revealed. A transitional stage between a liquid squeezing stage and a free pinch-off stage was newly observed and the transitional stage was named as the wave model stage because of the long-wave approximation of the interface at this stage. The time criteria between the three stages are proved to be around 1/10 of tcap (capillary time) and around tcap to the... (More)

The pinch-off dynamics during hydrogen bubble formation was experimentally investigated in a cross-junction microchannel. A binarization interface recognizing and key frame tracking method was established. By analyzing the breakup dynamics through spatial and time domains, the effects of interfacial tension and viscosity on hydrogen bubble pinch-off were revealed. A transitional stage between a liquid squeezing stage and a free pinch-off stage was newly observed and the transitional stage was named as the wave model stage because of the long-wave approximation of the interface at this stage. The time criteria between the three stages are proved to be around 1/10 of tcap (capillary time) and around tcap to the pinch-off moment, respectively. However, the power law exponents of the minimum radial radius R0 for hydrogen - liquid flow, larger than those for nitrogen - liquid flow, are consistent with literature works in terms of both range and tendency.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrogen, Interfacial tension, Microfluidics, Pinch-off dynamics, Taylor bubble
in
International Journal of Hydrogen Energy
volume
46
issue
67
pages
15 pages
publisher
Elsevier
external identifiers
  • scopus:85112457306
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2021.07.178
language
English
LU publication?
yes
id
fbbd2083-9ad0-4368-9d94-de6802ce22ab
date added to LUP
2021-09-17 10:29:21
date last changed
2025-04-04 15:16:21
@article{fbbd2083-9ad0-4368-9d94-de6802ce22ab,
  abstract     = {{<p>The pinch-off dynamics during hydrogen bubble formation was experimentally investigated in a cross-junction microchannel. A binarization interface recognizing and key frame tracking method was established. By analyzing the breakup dynamics through spatial and time domains, the effects of interfacial tension and viscosity on hydrogen bubble pinch-off were revealed. A transitional stage between a liquid squeezing stage and a free pinch-off stage was newly observed and the transitional stage was named as the wave model stage because of the long-wave approximation of the interface at this stage. The time criteria between the three stages are proved to be around 1/10 of t<sub>cap</sub> (capillary time) and around t<sub>cap</sub> to the pinch-off moment, respectively. However, the power law exponents of the minimum radial radius R<sub>0</sub> for hydrogen - liquid flow, larger than those for nitrogen - liquid flow, are consistent with literature works in terms of both range and tendency.</p>}},
  author       = {{Li, Xingchen and Wu, Zan and Chen, Xiaoqian}},
  issn         = {{0360-3199}},
  keywords     = {{Hydrogen; Interfacial tension; Microfluidics; Pinch-off dynamics; Taylor bubble}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{67}},
  pages        = {{33438--33452}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Hydrogen Energy}},
  title        = {{Analysis on breakup dynamics of hydrogen taylor bubble formation in a cross-junction microchannel}},
  url          = {{http://dx.doi.org/10.1016/j.ijhydene.2021.07.178}},
  doi          = {{10.1016/j.ijhydene.2021.07.178}},
  volume       = {{46}},
  year         = {{2021}},
}