77th Annual Meeting of the APS Division of Fluid Dynamics (November 24, 2024 — November 26, 2024)

P2690444: Enhanced singular jet formation

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Authors

• Zhengyu Yang, University of Illinois at Urbana-Champaign
• Bingqiang Ji, University of Illinois at Urbana-Champaign
• Jesse T. Ault, Brown University
• Jie Feng, University of Illinois at Urbana-Champaign

DOI: https://doi.org/10.1103/APS.DFD.2024.GFM.P2690444

Drops produced by bubble bursting jet play an important role in mass transport across an air-liquid interface, impacting global climate, air pollution and disease transmission. Here, we showcase how a compound coating, representing a contaminant layer, influences the jet dynamics. We illustrate an extremely fast and thin jet, i.e. singular jet, produced by bursting of bubbles coated with a Newtonian oil layer, using direct numerical simulation. The jet consists solely of the oil accumulating at the cavity bottom, and it fragments into drops as small as a few microns. Compared with bare bubbles, these compound bubbles effectively enhance the production of tiny drops, as demonstrated by the time-lapse images in our collective bubble bursting experiments. The smaller contaminant drops may remain suspended in the atmosphere longer and penetrate further into the respiratory tract, increasing risk for pollutant transport and disease transmission, thus warranting special attention.