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Oblique Impact of a Droplet on a Textured Substrate

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IUTAM Symposium on Recent Advances in Moving Boundary Problems in Mechanics

Part of the book series: IUTAM Bookseries ((IUTAMBOOK,volume 34))

Abstract

This study presents the modelling of an oblique drop impact on a textured substrate using the multiphase lattice Boltzmann method to understand the conditions under which the lamella lifts off the substrate and generates a satellite droplet. Depending on the impact angle and the Weber number, four various outcomes are observed: asymmetric spreading, bilateral splashing including a prompt splash and a corona splash, one-sided coronal splashing and asymmetric break-up. To obtain a better understanding of when splashing is likely to occur, a graph which shows splashing thresholds for a range of normal Weber numbers and impact angles between 5° and 45° is presented. Numerical results show that an increasing proportion of the droplet bounces off the surface in the form of satellite droplets for increasingly tangential impacts. Furthermore, the influence of substrate texture parameters such as the height of posts and wettability of the substrate are investigated. Results show that splashing vanishes as the wettability of the substrate increases. Also, the space between posts and the height of posts is shown to play an important role on the occurrence of splashing.

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Acknowledgements

The authors gratefully acknowledge the support of MBIE through the Smart Ideas Endeavour fund for the project “Impact for Spray Drying”.

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Authors and Affiliations

  1. University of Canterbury, Christchurch, 8041, New Zealand

    Hossein Rashidian & Mathieu Sellier

Authors
  1. Hossein Rashidian
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  2. Mathieu Sellier
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Correspondence to Mathieu Sellier .

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Editors and Affiliations

  1. Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand

    Stefanie Gutschmidt

  2. Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand

    James N. Hewett

  3. Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand

    Mathieu Sellier

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Rashidian, H., Sellier, M. (2019). Oblique Impact of a Droplet on a Textured Substrate. In: Gutschmidt, S., Hewett, J., Sellier, M. (eds) IUTAM Symposium on Recent Advances in Moving Boundary Problems in Mechanics. IUTAM Bookseries, vol 34. Springer, Cham. https://doi.org/10.1007/978-3-030-13720-5_11

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  • DOI: https://doi.org/10.1007/978-3-030-13720-5_11

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-13719-9

  • Online ISBN: 978-3-030-13720-5

  • eBook Packages: EngineeringEngineering (R0)

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