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Study of solids conveying in single screw extruders based on flow dynamics and ...
Michelangelli, O. P.; Gaspar-Cunha, A.; Covas, J. A.Flow of granular matter is presently a subject of extensive research, due to the characteristics of this type of systems (e.g., dilatancy, segregation, arching, clustering) and relevance to various application areas, such as civil construction, agriculture, food processing, geophysics, pharmacology [1, 2]. The plasticating process in single screw polymer extrusion is one of the areas where this research can hel...
Computational study of the granular flow through an elbow
Michelangelli, O. P.; Sánchez, Ivan; Darias, RamónIf a granular material inside a U-shaped tube is vertically vibrated, some interesting phenomena can be observed. Depending on the amplitude and frequency of vibration, the wall-grain interaction and the presence of an interstitial fluid, the granular material inside the tube can show a tendency to accumulate in one of his branches [1, 2]. The influence of the container walls on the granular material during the...
Flow dynamics and structure of solid pellets along the channel of a single scre...
Michelangelli, O. P.; Yamanoi, M.; Gaspar-Cunha, A.; Covas, J. A.Plasticating single screw extrusion involves the progressive compaction and heating of loose solid pellets that eventually melt, form a relatively homogenous stream and are subsequently pumped through a shaping tool. Traditional analyses of the solids conveying stage assume the sliding of an elastic solid plug due to differential wall friction coefficients. However, not only the corresponding predictions may fa...
Modelling pellet flow in single extrusion with DEM
Michelangelli, O. P.; Yamanoi, Masayuki; Gaspar-Cunha, A.; Covas, J. A.Plasticating single-screw extrusion involves the continuous conversion of loose solid pellets into a pressurized homogeneous melt that is pumped through a shaping tool. Traditional analyses of the solids conveying stage assume the movement of an elastic solid plug at a fixed speed. However, not only the corresponding predictions fail considerably, but it is also well known that, at least in the initial screw tu...
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