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Near-critical spreading of droplets

Abstract : We study the spreading of droplets in a near-critical phase-separated liquid mixture, using a combination of experiments, lubrication theory and finite-element numerical simulations. The classical Tanner's law describing the spreading of viscous droplets is robustly verified when the critical temperature is neared. Furthermore, the microscopic cut-off length scale emerging in this law is obtained as a single free parameter for each given temperature. In total-wetting conditions, this length is interpreted as the thickness of the thin precursor film present ahead of the apparent contact line. The collapse of the different evolutions onto a single Tanner-like master curve demonstrates the universality of viscous spreading before entering in the fluctuation-dominated regime. Finally, our results reveal a counter-intuitive and sharp thinning of the precursor film when approaching the critical temperature, which is further attributed to the vanishing spreading parameter at the critical point and the associated increasing role of critical Casimir forces in the thin precursor film.
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https://hal.archives-ouvertes.fr/hal-03739843
Contributor : Thomas Salez Connect in order to contact the contributor
Submitted on : Thursday, July 28, 2022 - 12:50:08 PM
Last modification on : Tuesday, August 2, 2022 - 4:24:00 AM

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  • HAL Id : hal-03739843, version 1
  • ARXIV : 2207.13997

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CNRS | LOMA | ANR

Citation

Raphael Saiseau, Christian Pedersen, Anwar Benjana, Andreas Carlson, Ulysse Delabre, et al.. Near-critical spreading of droplets. 2022. ⟨hal-03739843⟩

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