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2021 | OriginalPaper | Buchkapitel

Spreading Time of Liquid Droplets Impacting on Non-wetting Solid Surfaces

verfasst von : Yang Xu, Stéphane Vincent, Q.-C. He, H. Le-Quang

Erschienen in: Turbulence and Interactions

Verlag: Springer International Publishing

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Abstract

The spreading time that a droplet takes to reach its maximum spreading state is a parameter of paramount importance. We study the impact of a liquid droplet on a super-hydrophobic surface. A contact angle of \(\theta =170^{\circ }\) is used as the numerical input for the non-wetting property of the surface. Numerical simulations to understand the effects of initial impact conditions on spreading time of liquid droplets onto solid surfaces are conducted in a regime where \(1<We<300\) and \(1<Re<300\). We demonstrate that the spreading time \(t_{max} \) is jointly determined by the inertial, capillary and viscous forces. The spreading time \(t_{max}\) decreases exponentially with the increase of the impact velocity \(V_{0}\) and surface tension \(\sigma \). Regarding the influences of dynamical viscosity on spreading time, the effects of dynamic viscosity is secondary at low Weber numbers (\(We<5\)), while in a moderate Weber number regime (\(5<We<300\)), the effects of dynamic viscosity should be taken into account. Finally, in our study, we successfully scale the dimensionless spreading time in the form as \(t_{max}^{*}/Re^{1/5} \sim WeRe^{-2/5}\).

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Titel: Spreading Time of Liquid Droplets Impacting on Non-wetting Solid Surfaces
verfasst von: Yang Xu
Stéphane Vincent
Q.-C. He
H. Le-Quang
Verlag: Springer International Publishing
Buch: Turbulence and Interactions
Print ISBN: 978-3-030-65819-9

Electronic ISBN: 978-3-030-65820-5

Copyright-Jahr: 2021
DOI: https://doi.org/10.1007/978-3-030-65820-5_24

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