Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.powtec.2010.05.012
Title: Experimental study of liquid drop impact onto a powder surface
Authors: Marston, J.O.
Thoroddsen, S.T.
Ng, W.K.
Tan, R.B.H. 
Keywords: Drop impact
Granulation
High-speed imaging
Nucleation
Issue Date: Nov-2010
Citation: Marston, J.O., Thoroddsen, S.T., Ng, W.K., Tan, R.B.H. (2010-11). Experimental study of liquid drop impact onto a powder surface. Powder Technology 203 (2) : 223-236. ScholarBank@NUS Repository. https://doi.org/10.1016/j.powtec.2010.05.012
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.
Source Title: Powder Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/88879
ISSN: 00325910
DOI: 10.1016/j.powtec.2010.05.012
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