An Investigation of Venturi and Coanda Effects in Blown Film Cooling Journal Articles

abstract

• 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.

authors

• Sidiropoulos, V
• Vlachopoulos, John

status

• published 

publication date

• March 1, 2000

has subject area

• 0912 Materials Engineering (FoR)
• Polymers (Science Metrix)

published in

• International Polymer Processing  Journal

keywords

• Engineering
• Engineering, Chemical
• Physical Sciences
• Polymer Science
• Science & Technology
• Technology

Digital Object Identifier (DOI)

• 10.3139/217.1575

start page

• 40

end page

• 45

volume

• 15

issue

• 1