In order to improve a numerical model for bulk solid investigations calculating dust emissions when handling bulk materials [1] adhesion force measurements were carried out for the used reference material. This reference material represents a bulk solid in its main parts, the fine fraction and the coarse fraction.

Here, the coarse fraction is represented by metal spheres (diameter of 1500 µm) and as fine fraction a calcium carbonate powder (x_50,3 = 19.5 µm) is used. Since, the determination of the adhesive force between these two fractions is not trivial, measurements were performed. The aim was to identify the adhesive force between a metal sphere and the calcium carbonate powder in order to improve dust detachment functions at a single particle level [2]. However, it turned out that ...