Experimental and computational identification of a polymer melt flow instability

David G. Hassell, Malcolm R. Mackley, Mehmet Sahin, Helen J. Wilson

Araştırma sonucu: Kitap/Rapor/Konferans Bildirisinde BölümKonferans katkısıbilirkişi

2 Atıf (Scopus)

Özet

Entangled polymer melts exhibit a variety of flow instabilities that limit production rates in industrial applications. We study one such flow instability, in a contraction-expansion geometry, through both experiment and numerical calculation. The experiments investigate the flow of monodisperse linear polystyrenes in a multi-pass rheometer, and we present observations of a bulk instability, which is first observed at the slit outlet and subsequently produces large-scale fluid motions upstream. The numerical study uses linear stability theory with a semi-staggered finite-volume scheme, and models the fluid using the Rolie-Poly constitutive equation. The numerical results confirm the instability and we are able to identify important parameters for instability within the model. This gives a physical insight into the underlying mechanisms involved.

Orijinal dilİngilizce
Ana bilgisayar yayını başlığıThe XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
Sayfalar147-149
Sayfa sayısı3
DOI'lar
Yayın durumuYayınlandı - 2008
Harici olarak yayınlandıEvet
Etkinlik15th International Congress on Rheology - Monterey, CA, United States
Süre: 3 Ağu 20088 Ağu 2008

Yayın serisi

AdıAIP Conference Proceedings
Hacim1027
ISSN (Basılı)0094-243X
ISSN (Elektronik)1551-7616

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???event.eventtypes.event.conference???15th International Congress on Rheology
Ülke/BölgeUnited States
ŞehirMonterey, CA
Periyot3/08/088/08/08

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