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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 |
Appears in Collections: | Staff Publications |
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