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The effects of dual‐orifice air‐ring design on blown film cooling
Author(s) -
Sidiropoulos V.,
Vlachopoulos J.
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11292
Subject(s) - body orifice , materials science , turbulence , airflow , mechanics , heat transfer , ring (chemistry) , flow (mathematics) , air cooling , mechanical engineering , thermodynamics , physics , engineering , chemistry , organic chemistry
Abstract Numerical simulations of turbulent air flows tangentially impinging on blown film bubbles have been carried out. The cooling air is assumed to originate from a dualorifice adjustable air‐ring. The streamline patterns and heat fluxes are determined through a finite volume numerical technique for modeling of turbulent air flow. It is shown that cooling efficiency is critically sensitive to the air‐ring design as minor modifications cause large variations in cooling performance. Additionally, for a given design, the operational setup of the air ring is equally critical to the cooling performance. It is explained that the large influence observed on heat transfer rates is primarily due to the Coanda effect, which forces air jets to attach themselves to surfaces.