75th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2022 — November 22, 2022)

V0043: How many drops? Multiple drop generation in partial coalescence.

Authors

• Teng Dong, ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom
• Panagiota Angeli, ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom

DOI: https://doi.org/10.1103/APS.DFD.2022.GFM.V0043

The video presents our recent discoveries on the multiple drop generation during the coalescence of drop on the liquid interface by simply adding surfactants in the liquids system. This work delivers new knowledge that surfactants do not only prevent the partial coalescence as previously reported, but also produce multiple droplets under certain conditions. The mechanism of the partial coalescence is reviewed based on the new experimental results, and the Rayleigh-Plateau instability is found  to contribute to the process. The discovery provides a new perspective to explain the partial coalescence of drops in science and offers references for multiphase system processing where surfactants are present.