Abstract
ABSTRACT Disk stack separators represent an industrial standard for mechanical separation within a large range of applications. To date, the prediction of separation efficiencies for disk stack separators is largely based on the concept of the equivalent clarification area, namely the Σ-Theory. This theory is based on various simplifying assumptions which lead to inconsistencies with experimental results. The separation process inside the top disk gap of a disk stack centrifuge with a transparent bowl top is visualized using a high-speed camera. The influence of disk geometry parameters on the flow and particle separation is analyzed by image processing and the unused clarification areas are determined. The analysis shows that the ratio of unused clarification area is significant. Abbreviations: GEA: GEA Group AG; PMSQ: Polymethyl silsesquioxane beads; PVAc: Poly(vinyl acetate) beads; rpm: Revolutions per minute; 3D: Three-dimensional
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