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Journal Article

Initial solidification dynamics of spreading droplets

MPS-Authors
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Lohse,  Detlef
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

/persons/resource/persons221664

van Limbeek,  Michiel A. J.
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Koldeweij, R. B. J., Kant, P., Harth, K., de Ruiter, R., Gelderblom, H., Snoeijer, J. H., et al. (2021). Initial solidification dynamics of spreading droplets. Physical Review Fluids, 6: L121601. doi:10.1103/PhysRevFluids.6.L121601.


Cite as: https://hdl.handle.net/21.11116/0000-0009-BF90-D
Abstract
When a droplet is brought in contact with an undercooled surface, it wets the substrate
and solidifies at the same time. The interplay between the phase transition effects and the
contact-line motion, leading to its arrest, remains poorly understood. Here we reveal the
early solidification patterns and dynamics of spreading hexadecane droplets. Total internal
reflection imaging is employed to temporally and spatially resolve the early solidification
behavior. With this, we determine the conditions leading to the contact-line arrest. We
quantify the overall nucleation behavior, i.e., the nucleation rate and the crystal growth
speed and show its sensitivity to the applied undercooling of the substrate. We also
show that for strong enough undercooling it is the rapid growth of the crystals which
determines the eventual arrest of the spreading contact line. By combining the JohnsonMehl-Avrami-Kolmogorov nucleation theory and scaling relations for the spreading, we
calculate the temporal evolution of the solid area fraction, which is in good agreement with
our observations.