No CrossRef data available.
Article contents
Drop impact on a sticky porous surface with gas discharge: transformation of drops into bubbles
Published online by Cambridge University Press: 05 December 2022
Abstract
The impact of drops on a porous surface with high contact-angle hysteresis and gas discharge is studied. Four different impact modes, ranging from complete repulsion to fast immobilization of a drop on the surface, are identified and mapped in a space spanned by the pressure difference of the gas across the porous surface and the impact Weber number of the drop. The most remarkable aspect of the dynamics is the transformation of a drop into a bubble, which occurs when a drop just overcomes the repulsion by the gas flow and wets the surface. The transition to the regime in which a drop is transformed to a bubble is well described by a simple scaling relationship based on a balance between inertia and the repulsive force due to the gas flow.
JFM classification
- Type
- JFM Papers
- Information
- Copyright
- © The Author(s), 2022. Published by Cambridge University Press
References
REFERENCES
Weimar et al. Supplementary Movie 1
Video showing IM0 for a water drop. Drop impact velocity 0.18~m~s$^{-1}$, gas velocity 2.94~m~s$^{-1}$, drop radius 1.42~mm.
Weimar et al. Supplementary Movie 2
Video showing IM1 for a water drop. Drop impact velocity 0.49~m~s$^{-1}$, gas velocity 2.92~m~s$^{-1}$, drop radius 1.37~mm.
Weimar et al. Supplementary Movie 3
Video showing IM2 for a water drop. Drop impact velocity 0.90~m~s$^{-1}$, gas velocity 2.95~m~s$^{-1}$, drop radius 1.41~mm.
Weimar et al. Supplementary Movie 4
Video showing IM3 for a water drop. Drop impact velocity 1.10~m~s$^{-1}$, gas velocity 2.96~m~s$^{-1}$, drop radius 1.42~mm.
Weimar et al. Supplementary Movie 5
Video showing the bubble formation from a water drop. Drop impact velocity 0.67~m~s$^{-1}$, gas velocity 1.64~m~s$^{-1}$, drop radius 1.41~mm.