4.6 Article

Breakup Dynamics of Droplets in Symmetric Y-Junction Microchannels

期刊

APPLIED SCIENCES-BASEL
卷 12, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/app12084011

关键词

breakup dynamics; microchannels; droplet dimensionless length correlation

资金

  1. Guangdong Basic and Applied Basic Research Foundation [2019A1515111116]
  2. Shandong Province Natural Science Foundation [ZR2021ME080]
  3. Shandong Provincial Postdoctoral Innovation Project [201902002]
  4. Foundation of Shandong University for Young Scholar's Future Plans, and Double First-Class Foundation for the Talents of Shandong University [31380089963090]

向作者/读者索取更多资源

The experimental method was used to study the droplet breaking characteristics of a two-phase immiscible liquid-liquid system in symmetric Y-junction microchannels. The results showed that the breakup behavior of the droplets had an impact on the flow pattern and the length of the sub-droplets. A correlation formula for predicting the length of the sub-droplets was proposed.
The experimental method is used to study the droplet breaking characteristics of an immiscible liquid-liquid t8wo-phase fluid in symmetric Y-junction microchannels. Silicone oil is used as the dispersed phase and distilled water containing 0.5% SDS is used as the continuous phase. Three breakup behaviors were observed: breakup with permanent obstruction, breakup with gaps, and no breakup. Two stages of the change of the neck width of the sub-droplet during the breakup process were discovered: a rapid breakup stage and a thread breakup stage. The effect of the breakup behavior on the flow pattern was investigated and it was found that the breakup behavior of the droplets made the slug flow area smaller; further, a new flow pattern was observed, being droplet flow. The length of the sub-droplet increases with an increase of the volume flow rate of the dispersed phase and the ratio of the volume flow rate of the dispersed phase to the continuous phase, while decreasing with an increase of the volume flow rate and the capillary number of the continuous phase. Based on the influence of the two-phase flow parameters on the length of the sub-droplet, a correlation formula for the length of the sub-droplet with good predictive performance is proposed.

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