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The combined influence of a rough surface and thin fluid film upon the splashing threshold and splash dynamics of a droplet impacting onto them

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Abstract

Surface roughness can have a critical effect upon the splashing threshold and dynamics of a drop impacting on either a dry or rough solid surface or one coated by a thin fluid film. As most coating applications and spray systems quickly evolve to a state where the droplets im**e upon fluid deposited by preceding droplets, the combined contributions of surface roughness and a pre-deposited thin liquid film of comparable thickness upon droplet im**ement dynamics are examined. For comparison, we include results for droplets impacting on a smooth, dry surface and a smooth surface wetted by a thin fluid film. The inclusion of surface roughness considerably lowers the splashing threshold and alters the splashing dynamics such that differences in fluid surface tensions between 20.1 and 72.8 dynes/cm or viscosities between 0.4 and 3.3 cP have little effect.

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Acknowledgements

This work was supported by a NASA NRA 01-HEDs-03 Fluid Physics award (RVW) administered through NASA cooperative agreement NCC3-975 with The National Center for Microgravity Research on Fluids and Combustion (NCMR) at The NASA-Glenn Research Center. Disclaimer: Trade names or manufacturers’ names are used for identification only. This usage does not constitute an official endorsement, either expressed or implied by either the National Aeronautics and Space Administration or The National Center for Microgravity Research.

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  1. NASA-Glenn, M.S. 110-3, 21000 Brookpark Rd, Cleveland, OH, 44135, USA

    Randy L. Vander Wal, Gordon M. Berger & Steven D. Mozes

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  1. Randy L. Vander Wal
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  2. Gordon M. Berger
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  3. Steven D. Mozes
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Correspondence to Randy L. Vander Wal.

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Vander Wal, R.L., Berger, G.M. & Mozes, S.D. The combined influence of a rough surface and thin fluid film upon the splashing threshold and splash dynamics of a droplet impacting onto them. Exp Fluids 40, 23–32 (2006). https://doi.org/10.1007/s00348-005-0043-3

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  • DOI: https://doi.org/10.1007/s00348-005-0043-3

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