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

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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 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.

Detaljer

Författare
  • Xingchen Li
  • Yiyong Huang
  • Xiaoqian Chen
  • Zan Wu
Enheter & grupper
Externa organisationer
  • National University of Defense Technology
  • National Institute of Defense Technology Innovation, PLA AMS
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi

Nyckelord

Originalspråkengelska
Artikelnummer115473
TidskriftChemical Engineering Science
Volym215
StatusPublished - 2020 apr 6
PublikationskategoriForskning
Peer review utfördJa