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Size amplification of jet drops due to insoluble surfactants

Jun Eshima1,*, Tristan Aurégan1,*, Palas Kumar Farsoiya2, Stéphane Popinet3, Howard A. Stone1, and Luc Deike1,4,†

  • *These authors contributed equally to this work.
  • †Contact author: ldeike@princeton.edu

Phys. Rev. Fluids 10, 123604 – Published 30 December, 2025

DOI: https://doi.org/10.1103/t9k3-dqyc

Abstract

Surface bubbles in the environment or engineering configurations, such as the ocean-atmosphere interface, sparkling wine, or during volcanic eruptions typically live on contaminated surfaces. A particularly common type of contamination is surface active agents (surfactants). We consider the effect of insoluble surfactant on jet drop formation by bubble bursting. Contrary to the observed trend that surfactants decrease the ejected drop radius for bubbles with precursor capillary waves, we find that surfactants increase the ejected drop radius for bubbles without precursor capillary waves—a regime characteristic of small bubbles. Consequently, the results have fundamental implications for understanding aerosol distributions in contaminated conditions. We find that the trend reversal is due to the effect of Marangoni stresses on the focusing of the collapsing cavity. We demonstrate quantitative agreement on the jet velocity and drop size between laboratory experiments and numerical simulations by using the measured surface tension dependence on surfactant concentration as the equation of state for the simulations.

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