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The effect of interfacial properties and liquid flow on the stability of powder islands

Ong, Xin Yi, Taylor, Spencer and Ramaioli, Marco (2017) The effect of interfacial properties and liquid flow on the stability of powder islands In: Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, 03-07 Jul 2017, Montpellier, France.

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Abstract

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.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Ong, Xin Yix.ong@surrey.ac.ukUNSPECIFIED
Taylor, SpencerS.Taylor@surrey.ac.ukUNSPECIFIED
Ramaioli, Marcom.ramaioli@surrey.ac.ukUNSPECIFIED
Date : 30 June 2017
Identification Number : 10.1051/epjconf/201714009006
Copyright Disclaimer : © 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.
Related URLs :
Depositing User : Melanie Hughes
Date Deposited : 07 Sep 2017 09:34
Last Modified : 15 Sep 2017 07:37
URI: http://epubs.surrey.ac.uk/id/eprint/842206

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