Most industrial and laboratory blown film lines use an air ring with one or more lips to produce an annular air jet that cools the polymer extrudate. Experience in operating blown film lines indicates that the air flow around the bubble plays an important role in both heat transfer and momentum transfer. The former has received some attention in the literature, but few investigations have been made on the latter. This paper deals with the aerodynamic aspect of the blown film process. An air flow field similar…
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