LrgpV1, Main, Exploration, bibRecord, 000326

Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

Identifieur interne : 000326 ( Main/Exploration ); précédent : 000325; suivant : 000327

Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

Auteurs : Yutao Lu [République populaire de Chine] ; Taotao Fu [France] ; Chunying Zhu [République populaire de Chine] ; Youguang Ma [République populaire de Chine] ; Huai Z. Li [France]

Source :

Microfluidics and Nanofluidics [ 1613-4982 ] ; 2014-06.

RBID : Hal:hal-01275410

Abstract

The present work aims at studying the nonlinear breakup mechanism for Taylor bubble formation in a microfluidic flow-focusing device by using a high-speed digital camera. Experiments were carried out in a square microchannel with cross section of 600 x 600 mu m. During the nonlinear collapse process, the variation of the minimum radius of bubble neck (r(0)) with the remaining time until pinch-off (tau) can be scaled by a power-law relationship: r(0) proportional to tau(alpha). Due to the interface rearrangement around the neck, the nonlinear collapse process can be divided into two distinct stages: liquid squeezing collapse stage and free pinch-off stage. In the liquid squeezing collapse stage, the neck collapses under the constriction of the liquid flow and the exponent alpha approaches to 0.33 with the increase in the liquid flow rate Q(1). In the free pinch-off stage, the value of alpha is close to the theoretical value of 0.50 derived from the Rayleigh-Plesset equation and is independent of Q(1).

Url:

https://hal.univ-lorraine.fr/hal-01275410

DOI: 10.1007/s10404-013-1274-x

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 000906
to stream Hal, to step Curation: 000906
to stream Hal, to step Checkpoint: 000312
to stream Main, to step Merge: 000333
to stream Main, to step Curation: 000326

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<front><div type="abstract" xml:lang="en">The present work aims at studying the nonlinear breakup mechanism for Taylor bubble formation in a microfluidic flow-focusing device by using a high-speed digital camera. Experiments were carried out in a square microchannel with cross section of 600 x 600 mu m. During the nonlinear collapse process, the variation of the minimum radius of bubble neck (r(0)) with the remaining time until pinch-off (tau) can be scaled by a power-law relationship: r(0) proportional to tau(alpha). Due to the interface rearrangement around the neck, the nonlinear collapse process can be divided into two distinct stages: liquid squeezing collapse stage and free pinch-off stage. In the liquid squeezing collapse stage, the neck collapses under the constriction of the liquid flow and the exponent alpha approaches to 0.33 with the increase in the liquid flow rate Q(1). In the free pinch-off stage, the value of alpha is close to the theoretical value of 0.50 derived from the Rayleigh-Plesset equation and is independent of Q(1).</div>
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Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

Pinch-off mechanism for Taylor bubble formation in a microfluidic flow-focusing device

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Abstract

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