Modelling of the detachment of adhesive dust particles during bulk solid particle impact to enhance dust detachment functions

Abstract

The detachment of fine adhered dust particles during bulk particle contacts is studied with an adhesive Discrete Element Method (DEM) to describe the carrier and the dust particle motion. Further, dust detachment functions are realized in a non-adhesive DEM, in which only the coarse carrier particles are tracked as one composed bulk particle. The implemented detachment functions include three criteria, a normal and a tangential lift-off condition as well as a rotational condition. These functions are benchmarked based on dust-resolved adhesive DEM simulations by varying crucial parameters in the course of particle-particle and particle-wall contacts. In advance, the adhesive force is calibrated using experimental single drop tests. The detachment criteria reflect the physical detachment of individual dust particles well assuming dust particles with a narrow size distribution. The application of the enhanced dust detachment functions therefore allows to predict dust release of individual dust particles with significantly less computing time.