Experimental study of liquid drop impact onto a powder surface

Jeremy Marston, Sigurdur T Thoroddsen, Waikiong Ng, Reginald Tan

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

The initial dynamics of liquid drop impact onto powder surfaces is studied experimentally using high-speed photography. For a range of bed packing fractions, φ, liquid physical properties and impact velocities, ui, we observe a variety of phenomena that can be representative of a hydrophobic surface, a rough surface or a porous medium. The solids packing fraction in the bed, 0.38≤φ≤0.65, and the impact Weber number, 3.5≤We=ρDui 2/φ≤750, (where ρ, D and φ are the drop density, diameter and surface tension respectively) are shown to be the critical parameters governing the outcome of an impact. For high packing fractions, φ≳0.5, we show that the observed spreading, rebound and splashing can be broadly characterised in terms of the Weber number while for looser packing fractions, φ≲0.5, we observe powder ejectas and provide a qualitative description of the granule nucleation at the centre of the impact sites. © 2010 Elsevier B.V.
Original languageEnglish (US)
Pages (from-to)223-236
Number of pages14
JournalPowder Technology
Volume203
Issue number2
DOIs
StatePublished - Nov 2010

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Science and Engineering Research Council of A*STAR (Agency for Science, Technology and Research), Singapore. The authors would like to thank Ng Junwei for assistance in measurements of the powder size distribution and liquid viscosities.

ASJC Scopus subject areas

  • General Chemical Engineering

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