Numerical simulation study on the effect of supercritical carbon dioxide on particles in the microchannel slip zone

Supercritical carbon dioxide cleaning technology has many advantages over the traditional cleaning process, so it is necessary to study the effect of supercritical carbon dioxide flow on the adhering particles on the microchannel surface. In this paper, the magnitude of adhesion force between particles and microchannel substrate was analysed theoretically according to the different nature of microfine particles, and the action of supercritical carbon dioxide on particles during the flow in the microchannel in the slip zone was studied by COMSOL Multiphysics software with individual metal particles on the inner wall surface of the microchannel. Research shows that as the temperature of supercritical carbon dioxide fluid increases, the driving force and lateral lift decrease; as the inlet velocity increases, the driving force on the particles increases; as the pressure increases, the driving force increases; the magnitude of the driving force is proportional to the quadratic of the fluid density and inlet velocity; the increase of the driving force slows down significantly when the pressure increases to a certain degree; the greater the driving force on the particles, the better the cleaning effect better.