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Title: Flow behaviour of highly concentrated emulsions of supersaturated aqueous solution in oil
Authors: Foudazi, Reza 
Masalova, Irina 
Malkin, Alexander Ya 
Keywords: Flow curve;Yield stress;Viscous stress;Laplace pressure;Interdroplet interaction
Issue Date: 2011
Publisher: Springer
Source: Foudazi, R., Masalova, I. & Malkin, A.Y. 2011. Flow behaviour of highly concentr. Rheol Acta (2011) 50: 897. doi:10.1007/s00397-010-0505-2
Abstract: A set of highly concentrated water-in-oil emulsions with supersaturated dispersed phase were investigated in this work to verify and/or develop the models that have been presented both in the literature and in this work. The material used to form emulsions consisted of supersaturated oxidiser solution, hydrocarbon oil and PIBSA-based surfactants. The interfacial characteristics for different surfactant types were first examined. Then, the rheology of samples was studied, and different scaling methods and fitting of experimental data were studied. On the basis of flow curve measurements and observed τ\emphv∼γ˙1/2τ\emphv∼γ˙1/2 scaling, a modified version of Windhab model was suggested which showed excellent fitting of experimental results. The linear dependences of τy0/σ versus 1/d32 for studied emulsions showed non-zero intercept which implies a non-linear dependence (resulting from interdroplet interaction) to fulfil the zero-intercept requirement. It was established that the zero intercept condition was fulfilled in the τy0∼σ/d232τy0∼σ/d322 scaling, although the experimental results for different surfactants were not superimposed.
Appears in Collections:Eng - Journal articles (DHET subsidised)

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