Resuspension models for monolayer and multilayer deposits of graphite dust

For multilayer deposits, resuspension modelling is even more complex. Several models exist, but there is no sufficiently extensive validation. Furthermore, the models may even give contradicting trends of the resuspension rates. The KS-MB resuspension model applicable for multilayer deposits is proposed here and validated against available experimental data. It is concluded that important factors are deposit structure as well as adhesion forces and particle-to-particle contact forces. Furthermore, it is not possible to positively identify the trend of resuspension rates in multilayer deposits. The effect of the multiple layers is overwhelmed by uncertainties in the adhesion force definitions. The main recommendation from the current work is that further measurements of adhesion forces, preferably done for the actual materials and conditions (temperatures, pressures) of the analyzed system (for example HTR-PM) are crucial for development of models and accurate prediction of resuspension.