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.
References
1 Yeow, Y. J.: Fluid Mech. 75, p. 577 (1976)10.1017/S0022112076000396Suche in Google Scholar
2 Gupta, R. K., Wissbrun, A. M. K.: Polym. Eng. Sci. 22, p. 172 (1982)10.1002/pen.760220307Suche in Google Scholar
3 Kanai, T., White, J.: Polym. Eng. Sci. 24, p. 1185 (1984)10.1002/pen.760241508Suche in Google Scholar
4 Luo, X., Tanner, R.: Polym. Eng. Sci. 25, p. 620 (1985)10.1002/pen.760251008Suche in Google Scholar
5 Cain, J., Deen, M.: Polym. Eng. Sci. 28, p. 1527 (1988)10.1002/pen.760282303Suche in Google Scholar
6 Cao, B., Campbell, G.: Int. Polym. Process. 4, p. 114 (1989)10.3139/217.890114Suche in Google Scholar
7 Cao, B.: PhD Thesis, Clarkson University, Potsdam, NY (1989)Suche in Google Scholar
8 Campbell, G., Obot, N., Cao, B.: Polym. Eng. Sci. 32, 11, p. 751 (1992)10.1002/pen.760321107Suche in Google Scholar
9 Wolf, D., Feron, B., Wortberg, J.: Int. Polym. Process. 1, p. 38 (1997)10.3139/217.970038Suche in Google Scholar
10 Nagarajan, G., Campbell, G. A.: SPE ANTEC Tech. Papers, p. 162 (1995)Suche in Google Scholar
11 Hauck, J., Michaeli, W.: J. Reinf. Plast. Comp. 10, p. 895 (1999)10.1177/073168449901801003Suche in Google Scholar
12 Sidiropoulos, V., Vlachopoulos, J.: SPE ANTEC Tech. Papers part 1 (of 3), p. 108 (1998)Suche in Google Scholar
13 Sidiropoulos, V., Wood, P. E., Vlachopoulos, J.: J. Reinf. Plast. Comp. 18, p. 529 (1999)10.1177/073168449901800605Suche in Google Scholar
14 Akaike, O., Tsuji, T., Nagano, Y.: Int. Polym. Process. 2, p. 168 (1999)10.3139/217.1540Suche in Google Scholar
15 Gregory, A., Campbell, N., Ganesh, S., Campbell, W., Lana, B.: SPE ANTEC Tech. Papers, p. 49 (2003)Suche in Google Scholar
16 Huang, T. A.: Advances in Polym. Tech. 8(1), p. 65 (1988)10.1002/adv.1988.060080107Suche in Google Scholar
17 Ghaneh-Fard, A.: PhD Thesis, Ecole Polytechnique de Montreal (1996)Suche in Google Scholar
18 Sidiropoulos, V., Vlachopoulos, J.: Int. Polym. Process. 1, p. 40 (2000)10.3139/217.1575Suche in Google Scholar
19 Sidiropoulos, V., Vlachopoulos, J.: Polym. Eng. Sci. 7, p. 1611 (2000)10.1002/pen.11292Suche in Google Scholar
20 Gao, N., Li, S., Ewing, D.: Int. Polym. Process. 1, p. 68 (2005)10.3139/217.1866Suche in Google Scholar
21 Kim, S., Fang, Y., Lafleur, P. G., Carreur, P. J.: Polym. Eng. Sci. 44, p. 283 (2004)10.1002/pen.20027Suche in Google Scholar
22 Yakhot, V., Orszag, S. A.: J. Science. Comput. 1, p. 3 (1986)10.1007/BF01061452Suche in Google Scholar
23 Fluent Inc., “Fluent User’s Guide”, Version 6.2 (1998)Suche in Google Scholar
24 Sidiropoulos, V., Vlachopoulos, J.: Int. Polym. Process. 1, p. 48 (2001)10.3139/217.1625Suche in Google Scholar
25 Gamache, E.: PhD Thesis, Ecole Polytechnique de Montréal (2005)Suche in Google Scholar
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Artikel in diesem Heft
- 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
Artikel in diesem Heft
- 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
