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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
Organisations
External organisations
  • National University of Defense Technology
  • Academy of Military Science of the Chinese People's Liberation Army
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Fluid Mechanics and Acoustics

Keywords

  • Confinement, Interface, Microfluidics, Multiphase flow, Nonlinear dynamics, Pinch-off
Original languageEnglish
Article number110043
JournalExperimental Thermal and Fluid Science
Volume113
Publication statusPublished - 2020 May 1
Publication categoryResearch
Peer-reviewedYes