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An Investigation of Venturi and Coanda Effects in Blown Film Cooling

  • V. Sidiropoulos and J. Vlachopoulos
Published/Copyright: June 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 15 Issue 1

Abstract

Numerical simulation of turbulent air flow tangentially impinging on a blown film bubble has been carried out. The cooling air is assumed to originate from a dual orifice adjustable air-ring. The stream line pattern and heat flux are determined through a finite volume numerical technique using a version of the so called k-∊ modeling. It is shown that as the air flows through the air ring passage relatively large under-pressure is created (Venturi effect), which applies a suction to the bubble. Depending on the flow rates and geometrical configurations the air jet may attach itself (Coanda effect) to either the air ring surface and/or to the bubble. The Coanda effect has a significant influence on local heat flux. The numerical results suggest that the Venturi and Coanda effects influence significantly process stability, production rate and final film properties.

* Mail address: J. Vlachopoulos, Department of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario, Canada
Received: 1999-7-14
Accepted: 1999-11-8
Published Online: 2013-06-06
Published in Print: 2000-03-01

© 2000, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Editorial
  2. Sixth of a Series: Pioneer of Man-Made Fibers and Solution Spinning Louis-Marie-Hilaire Bernigaud, Comte de Chardonnet
  3. Screw Extrusion
  4. A Network Analysis of a Screw Mixing Zone
  5. Experimental and Numerical Study of Rhomboidal Mixing Sections
  6. Reactive Extrusion
  7. Bulk Polymerization of ∊-Caprolactone in Twin Screw Extruder
  8. Die Extrusion
  9. Computer Aided Optimisation of Profile Extrusion Dies
  10. Fibers and Films
  11. An Investigation of Venturi and Coanda Effects in Blown Film Cooling
  12. Blends
  13. Solidification Behaviour of PA6/iPP Blends at High Cooling Rates
  14. Polymer Blends with Fibrillar Phase Morphology Prepared by Self-Reinforcing Technique
  15. Molding
  16. Compressive Squeeze Flow of Generalized Newtonian Fluids with Apparent Wall Slip
  17. Comparative Study of Ziegler-Natta and Metallocene Based Polypropylenes in Injection Molding
  18. The Pressure-Volume-Temperature Behavior Polyethylene Melts
  19. Evaluation of the Thermal Behaviour of Injection Moulds
  20. Polymer Solidification under Pressure and High Cooling Rates
https://doi.org/10.3139/217.1575

Articles in the same Issue

  1. Editorial
  2. Sixth of a Series: Pioneer of Man-Made Fibers and Solution Spinning Louis-Marie-Hilaire Bernigaud, Comte de Chardonnet
  3. Screw Extrusion
  4. A Network Analysis of a Screw Mixing Zone
  5. Experimental and Numerical Study of Rhomboidal Mixing Sections
  6. Reactive Extrusion
  7. Bulk Polymerization of ∊-Caprolactone in Twin Screw Extruder
  8. Die Extrusion
  9. Computer Aided Optimisation of Profile Extrusion Dies
  10. Fibers and Films
  11. An Investigation of Venturi and Coanda Effects in Blown Film Cooling
  12. Blends
  13. Solidification Behaviour of PA6/iPP Blends at High Cooling Rates
  14. Polymer Blends with Fibrillar Phase Morphology Prepared by Self-Reinforcing Technique
  15. Molding
  16. Compressive Squeeze Flow of Generalized Newtonian Fluids with Apparent Wall Slip
  17. Comparative Study of Ziegler-Natta and Metallocene Based Polypropylenes in Injection Molding
  18. The Pressure-Volume-Temperature Behavior Polyethylene Melts
  19. Evaluation of the Thermal Behaviour of Injection Moulds
  20. Polymer Solidification under Pressure and High Cooling Rates
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