Summary, Conclusions and Outlook

Based on the findings of the literature review, the separation process in a cleaning device of a combine harvester can be characterized as a dispersed multiphase flow, where locally dilute and dense regimes (\( \alpha_{p} \ge 10^{ - 3} \)) are present at the same time. Fluid forces are driving particle motion and separation of grain from MOG together with the mechanical stimulation and the gravity. In particular, the drag force is the dominating part of the fluid forces; pressure gradient force, buoyancy force, added mass force, Basset force, Saffman force and Magnus force are neglected.