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Vortex formation in a dual-cavity coat-hanger die

✍ Scribed by Kwong-Yang Lee; Shu-Heng Wen; Ta-Jo Liu

Book ID
104522783
Publisher
Society for Plastic Engineers
Year
1990
Tongue
English
Weight
596 KB
Volume
30
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

The effects of cavity shapes, particularly the expansion and contraction angles, and the Theological properties of polymeric liquids on vortex formation in the cuter cavity of a dual‐cavity coat‐hanger die have been examined. For power‐law fluids, a vortex may appear in the expansion side of the outer cavity, and the size of the vortex is influenced by the expansion angle, the power‐law index, and the Reynolds number. Two viscoelastic fluids were used in the flow visualization experiment; for an aqueous polyacrylamide solution, a vortex may appear in the contraction side of the outer cavity and this vortex is influenced by the contraction angle and the fluid elasticity, but no vortex was observed for a Boger fluid.

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Analysis and simulation of non-Newtonian
Analysis and simulation of non-Newtonian flow in the coat-hanger die of a meltblown process
✍ Qin Sun; Dong Zhang πŸ“‚ Article πŸ“… 1998 πŸ› John Wiley and Sons 🌐 English βš– 182 KB πŸ‘ 2 views

Meltblown is one of the fastest growing processes for nonwoven production. The design of the coat-hanger geometry of a die is very important for meltblown technology. In this article, melt rheological properties were studied based on capillary rheometry, followed by analysis and simulation of the me