Yielding and fracturing of concentrated emulsions in narrow gaps
MetadataShow full item record
We used rheology and confocal microscopy techniques to characterise the flow of emulsions as the droplets were confined by increasing the drop volume fraction and reducing the distance between the shearing surfaces. Slip was minimised by matching the density of the oil and water phases. Attractive interactions between the drops caused them to flocculate. The contribution of the emulsion microstructure to its shear response becomes significant when the oil drop flocs almost span the distance between the surfaces. We found that confining the flow of droplet flocs causes a transition from a fluid phase with shear thinning flow behaviour into a jammed, solid-like material. The large deformations caused by flow at the maximum drop packing fraction induce droplet coalescence within highly localised regions of the emulsion.
Showing items related by title, author, creator and subject.
Miri light crude water-in-oil emulsions characterization – Rheological behaviour, stability and amount of emulsions formedWong, S.; Dol, S.; Wee, S.; Chua, Han Bing (2018)Emulsification, specifically formation of water-in-oil (W/O) emulsions, is a very common occurrence in the oil and gas industries which tend to occur naturally given the conditions of the industries. However, it is an ...
The effect of interfacial slip on the dynamics of a drop in flow: Part I. Stretching, relaxation, and breakupRamachandran, A.; Tsigklifis, Konstantinos; Roy, A.; Leal, G. (2012)Using a numerical method based on the boundary-integral technique, we assess the impact of interfacial slip on the dynamics of deformation and breakup of a single drop subjected to a uniaxial extensional flow under ...
Lim, Jit Sen (2016)This research presents the stability and phase inversion of water-oil emulsions formed through flow shear, and the effect on flow pressure drop. Flow pressure drop profile and dissipation energy profile are established ...