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

Research output: Contribution to journalArticle

Standard

Breakup dynamics of gas-liquid interface during Taylor bubble formation in a microchannel flow-focusing device. / Li, Xingchen; Huang, Yiyong; Chen, Xiaoqian; Sunden, Bengt; Wu, Zan.

In: Experimental Thermal and Fluid Science, Vol. 113, 110043, 01.05.2020.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

RIS

TY - JOUR

T1 - Breakup dynamics of gas-liquid interface during Taylor bubble formation in a microchannel flow-focusing device

AU - Li, Xingchen

AU - Huang, Yiyong

AU - Chen, Xiaoqian

AU - Sunden, Bengt

AU - Wu, Zan

PY - 2020/5/1

Y1 - 2020/5/1

N2 - This work aims to investigate the breakup dynamics of the gas-liquid interface during bubble formation in a microchannel flow-focusing device. An interface tracking method is developed to capture the profiles of the gaseous thread evolution. The results show that the pinch-off period can be further divided into a liquid squeezing stage and a free pinch-off stage in both the radial and axial directions. The time domain criterion between these two stages in a low viscous liquid, with Ohnesorge numbers Oh≪1, is proved to be shorter than the capillary time. The effects of surface tension, viscosity and gas inertial force exerting on the interface during the free pinch-off stage are proved similar to those in a quiescent liquid pool. The power law of the minimum diameter at the gaseous thread to the pinch-off remaining time in the present experiments agrees with previous studies in both ranges (1/3 to 1/2) and tendency.

AB - This work aims to investigate the breakup dynamics of the gas-liquid interface during bubble formation in a microchannel flow-focusing device. An interface tracking method is developed to capture the profiles of the gaseous thread evolution. The results show that the pinch-off period can be further divided into a liquid squeezing stage and a free pinch-off stage in both the radial and axial directions. The time domain criterion between these two stages in a low viscous liquid, with Ohnesorge numbers Oh≪1, is proved to be shorter than the capillary time. The effects of surface tension, viscosity and gas inertial force exerting on the interface during the free pinch-off stage are proved similar to those in a quiescent liquid pool. The power law of the minimum diameter at the gaseous thread to the pinch-off remaining time in the present experiments agrees with previous studies in both ranges (1/3 to 1/2) and tendency.

KW - Confinement

KW - Interface

KW - Microfluidics

KW - Multiphase flow

KW - Nonlinear dynamics

KW - Pinch-off

UR - http://www.scopus.com/inward/record.url?scp=85078098782&partnerID=8YFLogxK

U2 - 10.1016/j.expthermflusci.2020.110043

DO - 10.1016/j.expthermflusci.2020.110043

M3 - Article

VL - 113

JO - Experimental Thermal and Fluid Science

JF - Experimental Thermal and Fluid Science

SN - 1879-2286

M1 - 110043

ER -