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Particles and droplets in Foams - A simulation approach

Neethling, SJ (Imperial College London)
Monday 24 February 2014, 10:15-11:00

Seminar Room 1, Newton Institute


Co-author: Gareth Morris (Imperial College London)

Particles and droplets play an important role in the stability of many foam systems. For instance, particles play an important role in stabilising mineral flotation froths, while oil droplets can have a destabilising effect on the stability of detergent foams. This paper will present a number of studies in which the effect of particles, both individually and en-mass, on the stability of thin films and foams are investigated using simulations. The main simulation tool employed is Surface Evolver, which has been programmed to allow the constraints used to model the particle location to change in response to the forces exerted on the particle, both from the fluid interfaces and other particles. These simulations are coupled to small scale experiments in which the behaviour of thin films containing particles is studied using high speed video analysis. As well as particles, the influence of oil droplets on the behaviour of foams is investigated by means of simulation, with mechani sms by which these droplets can both stabilise and destabilise foams and thin films being demonstrated.


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