Abstract
Surfactant-induced Marangoni flows can alter the typical outward capillary flows in a drying droplet. Previous studies show that intricate time-dependent periodic motions of colloidal particles, such as Marangoni eddies and back-and-forth oscillatory motions, can be developed due to the coupled dynamics of surfactant and evaporation. Here, the temporal motions are investigated using a coarse-grained lattice model. We show that during the evaporation, aggregation and depletion zones of colloidal particles emerge close to the contact line when the capillary and Marangoni flows are comparable in the opposite directions. It is found that the type of periodic motions is determined by the initial surfactant concentration. When the strength of the Marangoni flows is sufficiently large at the early stage of evaporation swirling motions rather than oscillatory motions are developed. The periodic motions of particles persist until the surfactant concentration on the surface is saturated. Also, the onset and terminate times of the motions decrease with the initial surfactant concentration.
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This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018R1A2A2A05018901).
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Recommended by Editor Chang-Soo Han
Hae Won Seo is a Ph.D. student of the Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Korea. His research interests include Monte-Carlo method, meso-scale modelling, droplet evaporation and colloidal system.
Narina Jung is a post-doctoral researcher of the Department of Mechanical Engineering, UNIST, Ulsan, Korea. Her research interests include evaporation phenomena, colloidal suspension dynamics, and other areas of multiphase transport using mean-field theory, Monte-Carlo simulation, and lattice Boltzmann method.
Chun Sang Yoo is an Associate Professor of the Department of Mechanical Engineering, UNIST, Ulsan, Korea. His research interests are to solve smallscale fluid dynamics problems using MCS and LBM.
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Seo, H.W., Jung, N. & Yoo, C.S. Oscillation dynamics of colloidal particles caused by surfactant in an evaporating droplet. J Mech Sci Technol 34, 801–808 (2020). https://doi.org/10.1007/s12206-020-0128-1
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DOI: https://doi.org/10.1007/s12206-020-0128-1