Particles adhesion onto massive substrates: experimental measurement and deposition processes

摘要

Deposition of particles from a circulating fluid is a common industrial problem. The experimental methods stated in literature to determine the kinetics of particle adhesion, as well as the parameters which have an effect on this phenomenon are reviewed. The deposition process of rutile (TiO₂) particles, as a function of pH and stirring speed, onto glass and stainless steel has been studied using a laboratory set-up. For both materials, the maximum adhesion rate was obtained around pH=3·5-4, in the range where rutile particles are positively charged and wall materials are negatively charged. The increase in stirring speed has led to a decrease in adhesion rate, explained by an increase in the drag force which removes the deposited particles.