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Title: Modelling the motion and dispersion of liquid and particles in foams
Author: Meloy, John R.
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2004
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A model has been developed for the simulation of the motion of unattached particles through foams. The model uses previous work on the bulk drainage of liquid through foams (Verbist et al., 1996) in addition to a velocity profile equation which describes the local variation in liquid velocity over the Plateau border cross section (Sparrow and Loeffler, 1959). These descriptions of the liquid flow on two separate scales are combined with realistic foam structures (provided by Kraynik, 2004) to form a description of the liquid flow through the foam. This liquid flow description is used as a basis for the simulation of particle motion through the interconnected network of Plateau borders and vertices of the foam. The results of the particle motion simulation model have been used to calculate the dispersion of particles through the foam. The model was used to replicate experiments performed by Lee (2004) on the forced drainage of liquid and particles in a laboratory scale foam column. From the results of this replication it is possible to predict axial dispersion coefficients which are validated with experimental data. It is also possible to use the model to perform a sensitivity analysis to determine which parameters have the greatest effect on the particle motion and dispersion and therefore merit further investigation. For instance, the model has been used to calculate the effect of particle size on axial dispersion through the foam. Finally, a geometric dispersion coefficient has been calculated for the three› dimensional, random, monodisperse foam structure used in the simulations. This is an improvement on the previous coefficient calculation method which used a two› dimensional, regular foam structure. The calculated value of the geometric dispersion coefficient corresponds closely to a value predicted based solely on the foam structure used in the simulations. This further highlights the already known dependence of geometric dispersion on foam structure.
Supervisor: Cilliers, J. J. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available