Effect of Aerodynamics on Film Blowing Process
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Z. Zhang
Abstract
A Computational Fluid Dynamics (CFD) technique using a renormalization group (RNG) k –ε model and Fluent software was employed to analyze numerically the effects of aerodynamics on the air ring cooling system of a film blowing process. An in-line scanning camera system developed in our lab was used to study experimentally the detailed dynamics of bubble instabilities. An operation window for the heat transfer coefficient and the maximum air velocity function was established. The simulation results showed that it is adequate mainly at low BUR (Blow-Up-Ratio) outside of the air ring. The relationship between thermal inertia and cooling air aerodynamics for different bubble geometries was also explored. Different bubble shapes, for the same BUR, produced significant differences in the airflow pattern and heat transfer coefficient. The combination of experimental measurements and numerical simulations indicated that various cooling rates result in important variations in the dynamics of bubble instabilities for different BUR bubbles. It was observed that increasing the cooling rate can destabilize the lower BUR bubbles, but stabilize the higher ones due to the production of different bubble shapes. Finally, it is shown that the bubble instabilities depend on the static pressure distribution along the bubble surface, and that minimizing the pressure gradient can stabilize the bubbles.
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Articles in the same Issue
- Contents
- Rapid Communications
- A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution
- Regular Contributed Articles
- Structure Property Relationships in PA 6 and PP Copolymers Blended by Single and Twin Screw Extrusion
- Stretchability and Properties of Biaxially Oriented Polypropylene Film
- Dynamic Mold Surface Temperature Control Using Induction and Heater Heating Combined with Coolant Cooling
- Visualization of Melt-Flow Behavior Inside the Runner in Ultra High Speed Injection Molding
- Effects of Cavity Conditions on Transcription Molding of Microscale Prism Patterns Using Ultra-High-Speed Injection Molding
- Effect of Melt and Mold Temperature on Fiber Orientation during Flow in Injection Molding of Reinforced Plastics
- Invited Paper
- Polymer/Layered Silicate Nano-composites
- Regular Contributed Articles
- Paste Extrusion of Polytetrafluoroethylene: Temperature, Blending and Processing Aid Effects
- Influence of Viscosity-interface Modifier Interactions on Performance and Processability of Rice Hull PE Composites
- Single and Multi Objective Optimization for Injection Molding Using Numerical Simulation with Surrogate Models and Genetic Algorithms
- A Process Classification Number for the Solidification of Crystallizing Materials
- Effect of Aerodynamics on Film Blowing Process
- Analysis of Necking Deformation Behavior in High-Speed In-line Drawing Process of PET by On-line Diameter and Velocity Measurements
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Rapid Communications
- A Novel High Flow Rate Pin for Water-assisted Injection Molding of Plastic Parts with a More Uniform Residual Wall Thickness Distribution
- Regular Contributed Articles
- Structure Property Relationships in PA 6 and PP Copolymers Blended by Single and Twin Screw Extrusion
- Stretchability and Properties of Biaxially Oriented Polypropylene Film
- Dynamic Mold Surface Temperature Control Using Induction and Heater Heating Combined with Coolant Cooling
- Visualization of Melt-Flow Behavior Inside the Runner in Ultra High Speed Injection Molding
- Effects of Cavity Conditions on Transcription Molding of Microscale Prism Patterns Using Ultra-High-Speed Injection Molding
- Effect of Melt and Mold Temperature on Fiber Orientation during Flow in Injection Molding of Reinforced Plastics
- Invited Paper
- Polymer/Layered Silicate Nano-composites
- Regular Contributed Articles
- Paste Extrusion of Polytetrafluoroethylene: Temperature, Blending and Processing Aid Effects
- Influence of Viscosity-interface Modifier Interactions on Performance and Processability of Rice Hull PE Composites
- Single and Multi Objective Optimization for Injection Molding Using Numerical Simulation with Surrogate Models and Genetic Algorithms
- A Process Classification Number for the Solidification of Crystallizing Materials
- Effect of Aerodynamics on Film Blowing Process
- Analysis of Necking Deformation Behavior in High-Speed In-line Drawing Process of PET by On-line Diameter and Velocity Measurements
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
