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Titolo:
Stress measurements for contraction flows of viscoelastic polymer melts
Autore:
Martyn, MT; Nakason, C; Coates, PD;
Indirizzi:
Univ Bradford, Dept Mech & Med Engn, IRC Polymer Sci & Technol, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP , W Yorkshire, England
Titolo Testata:
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
fascicolo: 2-3, volume: 91, anno: 2000,
pagine: 123 - 142
SICI:
0377-0257(20000701)91:2-3<123:SMFCFO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
SLIT DIE; CONVERGING FLOWS; ENTRANCE REGION; BIREFRINGENCE;
Keywords:
contraction flow; stress measurement; polyolefin melt;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Coates, PD Univ Bradford, Dept Mech & Med Engn, IRC Polymer Sci & Technol,Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W YorkshireEngland BD7 1DP re, England
Citazione:
M.T. Martyn et al., "Stress measurements for contraction flows of viscoelastic polymer melts", J NON-NEWT, 91(2-3), 2000, pp. 123-142

Abstract

The work presented in the second of a series of three papers providing a comprehensive in-process study of polyolefin melt flows through the convergent section of slit dies. Here we focus on stress fields developed in several linear and branched polyolefin melts. Accurate measurement of stress optical coefficients derived from flow induced birefringence has enabled determination of shear and first normal stress difference fields in these polymers in an abrupt entry convergent flow geometry. The progression of stress growth with increase in melt flow rate is also described. The dimensionless stress ratio (centre line tensile stress to slit wall shear stress) has beenidentified as a quantity which correlates with the relative vortex size inthe linear and branched polyolefins. Fully developed entry flows on melt passage into the slit section are also studied and reflect relaxation characteristics of each polymer. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:49:40