Computational simulation of aerosol behaviour: Dissertation

Computational methods have been developed for the simulation of aerosol dynamics and transport. Coupled aerosol-computational fluid dynamics (CFD) models are presented. A boundary layer type sectional model is shown to be able to provide an accurate solution of aerosol formation dynamics equations in a laminar flow reactor within a reasonable computing time. A bivariate extension of the quadrature method of moments (QMOM) is also discussed. The models have been applied to combustion processes. Computational simulations with a one-dimensional sectional model demonstrate the feasibility of the Na2SO4-route fume formation mechanism theory for recovery boilers. Estimates of deposition velocities are obtained for particles of various sizes and inorganic vapours, and for various conditions. It is noted that aerosol dynamics and transport significantly affect alkali chloride deposition. There seems to be a great deal of variation in the proportions of alkali chloride particle and vapour deposition in the typical range of biofuel-fired boiler superheater conditions.