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Extension of 2½ D Control Volume Methods for Transverse Flow at Sprues, Gates and Junctions

Published/Copyright: June 4, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 12 Issue 3

Abstract

Commercial injection mold filling simulations use the lubrication approximation to model pressure and temperature during flow. This approximation is valid when flow streamlines are parallel to a cavity surface, such as when the cavity thickness is much smaller than the flow length. Yet this approximation may not be valid in complex cavities where the streamlines are not parallel. Flow through junctions, gates and sprues are always accompanied by a velocity component transverse to the mold surface which is not included in the model. Neglecting transverse flow through use of the lubrication approximation can result in anomalous changes in bulk mean temperature, filling patterns, and molecular and fiber orientation. This paper presents a mass balance algorithm for approximating transverse flow through gates, sprues and junctions. This new algorithm is presently suitable for only relatively simple geometries. Future work will attempt to make a similar algorithm for transverse flow through complex mold shapes with negligible penalty in additional computational run time.

* Mail address: Gibson Batch. 3M Center, Building 518-1-1, St. Paul, MN 55144, USA.
Published Online: 2013-06-04
Published in Print: 1997-09-01

© 1997, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Dedication In Memorial to Konathala Himasekhar (1957–1995)
  5. Regular Contributed Articles
  6. Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process
  7. Numerical Simulation of the Multi-Component Injection Moulding Process
  8. Shrinkage Prediction for Slowly-Crystallizing Thermoplastic Polymers in Injection Molding
  9. The Optimized Quasi-Planar Approximation for Predicting Fiber Orientation in Injection-Molded Composites1
  10. Modelling the PVT Behavior of Isotactic Polypropylene
  11. Extension of 2½ D Control Volume Methods for Transverse Flow at Sprues, Gates and Junctions
  12. Numerical Modelling of the Mould Filling Stage in Gas-Assisted Injection Moulding
  13. Modular Tangential Counter-Rotating Twin Screw Extrusion: Non-Newtonian and Non-Isothermal Simulation
  14. A Parametric Study of Sink Marks in Injection-Molded Plastic Parts using the Finite Element Method
https://doi.org/10.3139/217.970257

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Dedication In Memorial to Konathala Himasekhar (1957–1995)
  5. Regular Contributed Articles
  6. Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process
  7. Numerical Simulation of the Multi-Component Injection Moulding Process
  8. Shrinkage Prediction for Slowly-Crystallizing Thermoplastic Polymers in Injection Molding
  9. The Optimized Quasi-Planar Approximation for Predicting Fiber Orientation in Injection-Molded Composites1
  10. Modelling the PVT Behavior of Isotactic Polypropylene
  11. Extension of 2½ D Control Volume Methods for Transverse Flow at Sprues, Gates and Junctions
  12. Numerical Modelling of the Mould Filling Stage in Gas-Assisted Injection Moulding
  13. Modular Tangential Counter-Rotating Twin Screw Extrusion: Non-Newtonian and Non-Isothermal Simulation
  14. A Parametric Study of Sink Marks in Injection-Molded Plastic Parts using the Finite Element Method
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