| Issue |
EPJ Web Conf.
Volume 140, 2017
Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
|
|
|---|---|---|
| Article Number | 09006 | |
| Number of page(s) | 4 | |
| Section | Fluids and particles | |
| DOI | https://doi.org/10.1051/epjconf/201714009006 | |
| Published online | 30 June 2017 | |
https://doi.org/10.1051/epjconf/201714009006
The Effect of Interfacial Properties and Liquid Flow on the Stability of Powder Islands
1 Department of Chemical and Process Engineering, University of Surrey, United Kingdom GU2 7XH
2 Department of Chemistry, University of Surrey, United Kingdom GU2 7XH
* Corresponding author: x.ong@surrey.ac.uk
Published online: 30 June 2017
This study aims at understanding the interplay between the interfacial properties of the powder grains and the characteristics of the liquid flow used to disperse them, in order to obtain an effective dispersion of a powder in a liquid, avoiding air entrainment. The dispersion of grain “rafts” and powder islands “stacks” was investigated both on a static and on a moving air-liquid interface. Powder wicking prevents the formation of a powder island when the grain contact angle is below a critical contact angle. Above the critical contact angle, a powder island forms and grows to a critical depth that depends on grain radius and contact angle. Imposing a flow on the air-liquid interface can either promote water impregnation, reducing the depth of the powder island or destabilise the whole island. In the latter case, the island sinks, forming a heterogeneous powder structure that is wet outside and dry inside.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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