KINETICS OF SURFACE COAGULATION

A theory is developed for the surface coagulation of particles resulti ng from collisions between suspended flowing particles and particles d eposited on a surface analogous to the classical Smoluchowski model fo r orthokinetic coagulation, with and without taking into account collo idal and hydrodynamic interactions, The theory predicts an increase in the capture frequency with an increase in the radial distance from th e stagnation point, Experimental observations on the surface coagulati on of calcium carbonate particles done in a well-defined hydrodynamic flow held created by an impinging jet are in agreement with theory for small radial distances but show a decrease in capture frequency for l arge radial distances, possibly due to surface roughness of the collid ing particles. (C) 1995 Academic Press, Inc.