CERTAIN PROBLEMS WITH THE APPLICATION OF STOCHASTIC DIFFUSION-PROCESSES FOR THE DESCRIPTION OF CHEMICAL-ENGINEERING PHENOMENA - DIFFUSIONALCHANGE OF SOLID PARTICLE-SIZE

To the description of changes of solid particle size in population, th e application was proposed of stochastic differential equations and di ffusion equations adequate to them making it possible to express the d evelopment of these populations in time. Particular relations were der ived for some particle size distributions in flow and batch equipments . It was shown that it is expedient to complement the population balan ces often used for the description of granular systems by a ''diffusio n'' term making it possible to express the effects of random influence s in the growth process and/or particle diminution.