Leakage-Flow Models for Screw Extruders
Many theoretical analyses of extrusion ignore the effect of the flight clearance when predicting the pumping capability of a screw. This might be reasonable for conventional extruder screws with “normal” clearances but leads to errors when more advanced screw designs are considered. We present new l...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/13/12/1919 |
| _version_ | 1797530707842564096 |
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| author | Christian Marschik Wolfgang Roland Marius Dörner Georg Steinbichler Volker Schöppner |
| author_facet | Christian Marschik Wolfgang Roland Marius Dörner Georg Steinbichler Volker Schöppner |
| author_sort | Christian Marschik |
| collection | DOAJ |
| description | Many theoretical analyses of extrusion ignore the effect of the flight clearance when predicting the pumping capability of a screw. This might be reasonable for conventional extruder screws with “normal” clearances but leads to errors when more advanced screw designs are considered. We present new leakage-flow models that allow the effect of the flight clearance to be included in the analysis of melt-conveying zones. Rather than directly correcting the drag and pressure flows, we derived regression models to predict locally the shear-thinning flow through the flight clearance. Using a hybrid modeling approach that includes analytical, numerical, and data-based modeling techniques enabled us to construct fast and accurate regressions for calculating flow rate and dissipation rate in the leakage gap. Using the novel regression models in combination with network theory, the new approximations consider the effect of the flight clearance in the predictions of pumping capability, power consumption and temperature development without modifying the equations for the down-channel flow. Unlike other approaches, our method is not limited to any specific screw designs or processing conditions. |
| first_indexed | 2024-03-10T10:33:49Z |
| format | Article |
| id | doaj.art-0f158a26bfd1434dbe4df9a6467c7bb2 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T10:33:49Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-0f158a26bfd1434dbe4df9a6467c7bb22023-11-21T23:25:32ZengMDPI AGPolymers2073-43602021-06-011312191910.3390/polym13121919Leakage-Flow Models for Screw ExtrudersChristian Marschik0Wolfgang Roland1Marius Dörner2Georg Steinbichler3Volker Schöppner4Institute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, 4040 Linz, AustriaInstitute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, 4040 Linz, AustriaKunststofftechnik Paderborn, Paderborn University, 33098 Paderborn, GermanyInstitute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, 4040 Linz, AustriaKunststofftechnik Paderborn, Paderborn University, 33098 Paderborn, GermanyMany theoretical analyses of extrusion ignore the effect of the flight clearance when predicting the pumping capability of a screw. This might be reasonable for conventional extruder screws with “normal” clearances but leads to errors when more advanced screw designs are considered. We present new leakage-flow models that allow the effect of the flight clearance to be included in the analysis of melt-conveying zones. Rather than directly correcting the drag and pressure flows, we derived regression models to predict locally the shear-thinning flow through the flight clearance. Using a hybrid modeling approach that includes analytical, numerical, and data-based modeling techniques enabled us to construct fast and accurate regressions for calculating flow rate and dissipation rate in the leakage gap. Using the novel regression models in combination with network theory, the new approximations consider the effect of the flight clearance in the predictions of pumping capability, power consumption and temperature development without modifying the equations for the down-channel flow. Unlike other approaches, our method is not limited to any specific screw designs or processing conditions.https://www.mdpi.com/2073-4360/13/12/1919leakage flowextrusionmodeling and simulationpolymer processing |
| spellingShingle | Christian Marschik Wolfgang Roland Marius Dörner Georg Steinbichler Volker Schöppner Leakage-Flow Models for Screw Extruders Polymers leakage flow extrusion modeling and simulation polymer processing |
| title | Leakage-Flow Models for Screw Extruders |
| title_full | Leakage-Flow Models for Screw Extruders |
| title_fullStr | Leakage-Flow Models for Screw Extruders |
| title_full_unstemmed | Leakage-Flow Models for Screw Extruders |
| title_short | Leakage-Flow Models for Screw Extruders |
| title_sort | leakage flow models for screw extruders |
| topic | leakage flow extrusion modeling and simulation polymer processing |
| url | https://www.mdpi.com/2073-4360/13/12/1919 |
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