3-DIMENSIONAL MODELING OF NON-NEWTONIAN FLUID-FLOW IN A COAT-HANGER DIE

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The three-dimensional model of isothermal flow of power-law fluid in a coat-hanger die has been developed using finite element method. The shape of coat-hanger die used in the present model was determined according to the previous analytical design equation which is based on one-dimensional now model in the manifold and the slot. Because uniform flow rate across the die outlet is most important to achieve uniform thickness of extruded polymer sheet or film, flow rate distribution is mainly examined to determine the valid process condition for the design equation as the design parameters are changed. The effects of fluid property in terms of power-law index and process parameters not considered in one-dimensional design equation such as die inlet size and the presence of land were analyzed. Results show that the manifold angle is the most influencing design parameter on flow rate distribution. When the material of different power-lau index from design value is processed, the change of power-law index affects the uniformity of now rate appreciably.
Publisher
KOREAN INST CHEM ENGINEERS
Issue Date
1995-04
Language
English
Article Type
Article
Citation

KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.12, no.2, pp.236 - 243

ISSN
0256-1115
DOI
10.1007/BF02705652
URI
http://hdl.handle.net/10203/9641
Appears in Collection
CBE-Journal Papers(저널논문)
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