Experimental study of liquid drop impact onto a powder surface

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

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61 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

ASJC Scopus subject areas

  • Chemical Engineering(all)

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