In recent years, superhydrophobic materials are concerned due to its outstanding dynamics on droplet impingement. The surface with superhydrophobic material can produce a more intense re-bound motion compared with that without it. This obvious will reduce the fluid attaching with substrate. I totally agree with many researchers that at the same impact condition, the superhydrophobic surface will connect less water on the surface, therefore formulate less ice accretion.
My question is, whether there is any other factors affecting the drop freezing during the impact process. Is it only the dynamic effect? Will this effect maintain while it occurs in a high-speed impact process,which represents strongly unsteady heat transfer process? Will the contact angle make sense to heat transfer characteristics during impingement? Will it still be effective while the surface freezes under an extremely dangerous conditions? Will it be more serious ?
Anyone who are interested in this researches, please be hesitate to contact with me. That is a very interesting topic.
Superhydrophobic materials are usually micro or nano-rough.
The problem is that water nuclei appearing under icing on the surface are also nano-scaled and they easily penetrate into the grooves constituting a superhydrophobic surfaces. This effect promotes icing, see:
K. Rykaczewski, W.A. Osborn, J. Chinn, M.L. Walker, J.H.J. Scott, W. Jones, Ch.
Hao, S. Yao, Z. Wang, How nanorough is rough enough to make a surface
superhydrophobic during water condensation?, Soft Matter 8 (2012) 8786–
8794
Starostin A. et al. Drop-wise and film-wise water condensation processes
occurring on metallic micro-scaled surfaces, Applied Surface Science 444 (2018) 604–609
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