Fractal Model of the Surface Film Formed in the Process of Drying of Liquid Disperse Products on Substrates

This paper presents a model of the formation of the surface fi lm in the process of drying liquid dispersed products on solid substrates. The surface fi lm is modeled by constructing a fractal cluster formed on the basis of the algorithm of diffusion-controlled clustering with account for the accidental appearance of new particles within the limits of the contact line and calculating the formation kinetics of the modeled surface. We have obtained experimental values of the fractal dimension of the formed surface structures in the process of convective drying on substrates of a liquid post-liquor slop and a concrete plasticizer. The formula for calculating the probability of particle coalescence is given, it permits estimating the kinetic characteristics of the process of surface structure formation by drying.