Effect of droplet size on the rheological properties of highly-concentrated w/o emulsions

Malkin, A, Masalova, I, Slatter, P and Wilson, K 2004, 'Effect of droplet size on the rheological properties of highly-concentrated w/o emulsions', Rheologica Acta, vol. 43, no. 6, pp. 584-591.


Document type: Journal Article
Collection: Journal Articles

Title Effect of droplet size on the rheological properties of highly-concentrated w/o emulsions
Author(s) Malkin, A
Masalova, I
Slatter, P
Wilson, K
Year 2004
Journal name Rheologica Acta
Volume number 43
Issue number 6
Start page 584
End page 591
Total pages 8
Publisher Springer
Abstract Rheological properties of highly concentrated emulsions of the water-in-oil type were studied. Water phase (concentration approximately 91%) consists of a supersaturated aqueous solution of nitrate salts; water comprises less than 20% by mass. The average size of droplets, D, in the emulsions was varied. It was found that the emulsions are non-Newtonian liquids and flow curves measured in a sweep regime of shearing have clear low-shear-rate Newtonian domain. The complete flow curves are fitted by the Cross equation. The elastic modulus is practically constant in a very wide frequency range. Hence the viscoelastic relaxation processes might be expected at times > > 100 s and in the short-term side of the curve at approximately 0.01 s. The elastic modulus (measured in oscillating testing and in elastic recovery as well) is proportional to D-2 while the Newtonian viscosity is proportional to D-1. The time effects were observed: it was found that the emulsions behave as rheopectic materials because prolonged shearing results in an increase of viscosity in the low shear rate domain of several orders of magnitude.
Subject Chemical Engineering Design
DOI - identifier 10.1007/s00397-003-0347-2
Copyright notice © Springer-Verlag 2004.
ISSN 0035-4511
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