Conveying characteristics of co-rotating twin-screw extruder kneading blocks ? Comparison of various modeling approaches
Sprache des Titels:
Englisch
Original Buchtitel:
AIP Conf. Proc. 3012, 020016 (2024)
Original Kurzfassung:
Modeling fully-intermeshing co-rotating twin-screw extruders is commonly based on considerable simplifications. Kneading blocks are typically modeled as conveying elements using a representative screw pitch. This approach, however, does not capture occurring the leakage flow correctly. Additional limitations are faced for non-conveying kneading blocks with staggering angles of 90°, inferring that the drag-flow capability will be overestimated by this simplification. Another common complexity reduction is the flat-plate approximation, which allows the use of well-established conveying models developed for single-screw extrusion. However, the nip region and calendar flow can only be included rudimentary. In this work, we compare various approaches for modeling the conveying capability of fully-intermeshing co-rotating twin-screw extruder kneading blocks: (i) full three-dimensional numerical simulations of the true flow geometry including all clearances, (ii) full three-dimensional numerical simulation approximating the geometry as conveying element with representative screw pitch, (iii) flat-plate approximation using a representative rectangular cross section. To investigate the effect of the complexity reductions in modeling the conveying characteristics, various kneading block configurations are considered using different staggering angles, disk widths, and undercuts. We will further discuss the usefulness of each approach focusing on complexity, effort and prediction accuracy.
Sprache der Kurzfassung:
Englisch
Veröffentlicher:
AIP Publishing
Volume:
3012
Number:
1
Erscheinungsmonat:
5
Erscheinungsjahr:
2024
Anzahl der Seiten:
9
Notiz zur Publikation:
B2: THE 2ND INTERNATIONAL SYMPOSIUM ON PLASTICS TECHNOLOGY