Macroscopic modelling of the surface tension of polymer-surfactant systems by Bell, C, Breward, C, Howell, P, Penfold, J, Thomas, R

“…In this paper we shouw how an existing model based on the law of mass action can be extended to model the surface tension of weakly-interacting systems, and we also extend it further to produce a model for the surface tension of strongly interacting systems. …”

Macroscopic modeling of the surface tension of polymer-surfactant systems. by Bell, C, Breward, C, Howell, P, Penfold, J, Thomas, R

“…In this paper we show how an existing model based on the law of mass action can be extended to model the surface tension of weakly interacting systems, and we also extend it further to produce a model for the surface tension of strongly interacting systems. …”

Surface-tension- and injection-driven spreading of a thin viscous film by Kiradjiev, K, Breward, C, Griffiths, I

“…We consider the spreading of a thin viscous droplet, injected through a finite region of a substrate, under the influence of surface tension. We neglect gravity and assume that there is a precursor layer covering the whole substrate and that the rate of injection is constant. …”

Data for paper "Surface-tension- and injection-driven spreading of a thin viscous film" by Kiradjiev, K, Breward, C, Griffiths, I

A theoretical analysis of the surface tension profiles of strongly interacting polymer-surfactant systems. by Bell, C, Breward, C, Howell, P, Penfold, J, Thomas, R

“…Measurements of the surface tension of static polymer-surfactant mixtures as the concentrations of polymer and surfactant are varied produce interesting and surprising profiles. …”

Modelling foam drainage by Breward, C, Darton, R, Howell, P, Ockendon, J

“…The analysis shows that significant foam stability can arise from small surface tension variations.…”

Modelling foam drainage by Breward, C, Darton, R, Howell, P, Ockendon, J

“…The analysis shows that significant foam stability can arise from small surface tension variations.…”

The interaction between sodium alkyl sulfate surfactants and the oppositely charged polyelectrolyte, polyDMDAAC, at the air-water interface: the role of alkyl chain length and elec... by Penfold, J, Tucker, I, Thomas, R, Taylor, D, Zhang, X, Bell, C, Breward, C, Howell, P

“…The effect of alkyl chain length and electrolyte on the adsorption of sodium alkyl sulfate surfactants and the oppositely charged polyelectrolyte, polyDMDAAC, at the air-water interface has been investigated by surface tension and neutron reflectivity. The variations in the patterns of adsorption and surface tension behavior with alkyl chain length and electrolyte are discussed in the context of the competition between the formation of surface active surfactant/polyelectrolyte complexes and polyelectrolyte/surfactant micelle complexes in solution. …”

The mathematics of foam by Breward, C

“…A primary concern is to investigate how so-called `Marangoni stresses' (i.e. surface tension gradients), generated for example by the presence of a surfactant, act to stabilise a foam. …”

Long-wavelength stability of an unsupported multilayer liquid film falling under gravity by Dyson, R, Brander, J, Breward, C, Howell, P

“…The long-wavelength stability of an unsupported multilayer liquid film falling under the effects of gravity and surface tension is investigated. By considering the Navier-Stokes equations for two fluid layers in the high-Reynolds-number and small-aspect-ratio limits the steady-state solutions are obtained. …”

The effect of polar lipids on tear film dynamics by Aydemir, E, Breward, C, Witelski, T

“…The polar lipid is an insoluble surface species that locally alters the surface tension of the tear film. In the lubrication limit, the model reduces to two coupled nonlinear partial differential equations for the film thickness and the concentration of lipid. …”

The effect of polar lipids on tear film dynamics. by Aydemir, E, Breward, C, Witelski, T

“…The polar lipid is an insoluble surface species that locally alters the surface tension of the tear film. In the lubrication limit, the model reduces to two coupled non-linear partial differential equations for the film thickness and the concentration of lipid. …”

Mathematical modelling of the overflowing cylinder experiment by Howell, P, Breward, C

“…On reaching the top, the liquid forms a flat free surface which expands radially before overflowing down the side of the cylinder. The velocity, surface tension and surfactant concentration on the expanding free surface are measured using a variety of non-invasive techniques. …”

Mathematical modelling of the overflowing cylinder experiment by Howell, P, Breward, C

“…On reaching the top, the liquid forms a flat free surface which expands radially before overflowing down the side of the cylinder. The velocity, surface tension and surfactant concentration on the expanding free surface are measured using a variety of non-invasive techniques. …”

Modelling removal of sulphur dioxide from flue gas in purification devices by Kiradjiev, K

“…We begin by considering a fundamental fluid dynamics problem of spreading of a thin film under surface tension with liquid injection due to the chemical reaction. …”