A comprehensive study of low-density polyethylene in capillary flow

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dc.contributor.author Mitsoulis, E en
dc.contributor.author Zisis, T en
dc.contributor.author Ansari, M en
dc.contributor.author Hatzikiriakos, SG en
dc.date.accessioned 2014-03-01T02:52:49Z
dc.date.available 2014-03-01T02:52:49Z
dc.date.issued 2011 en
dc.identifier.uri http://hdl.handle.net/123456789/36090
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-84857877837&partnerID=40&md5=f71b3b65eda5a3b14078a53422824513 en
dc.subject Capillary flow en
dc.subject Excess pressure losses en
dc.subject Low density polyethylene en
dc.subject.other Bagley correction en
dc.subject.other Capillary dies en
dc.subject.other Comprehensive studies en
dc.subject.other Effect of pressure en
dc.subject.other Excess pressure en
dc.subject.other Experimental data en
dc.subject.other L/D ratio en
dc.subject.other Low density en
dc.subject.other Nonisothermal en
dc.subject.other Pressure dependence en
dc.subject.other Relaxation modulus en
dc.subject.other Rheological characterization en
dc.subject.other Slip effects en
dc.subject.other Time-temperature en
dc.subject.other Viscous models en
dc.subject.other Capillarity en
dc.subject.other Capillary flow en
dc.subject.other Plastic products en
dc.subject.other Pressure effects en
dc.title A comprehensive study of low-density polyethylene in capillary flow en
heal.type conferenceItem en
heal.publicationDate 2011 en
heal.abstract The capillary flow of a commercial LDPE melt was studied both experimentally and numerically. The excess pressure drop due to entry (Bagley correction), the compressibility, the effect of pressure on viscosity and the possible slip effects on the capillary data analysis have been examined. Using a series of capillary dies having different diameters, D and length-to-diameter L/D ratios, a full rheological characterization has been carried out, and the experimental data have been fitted both with a viscous model (Carreau-Yasuda) and a viscoelastic one (K-BKZ/PSM model). Particular emphasis has been given on the pressure-dependence of viscosity, with a pressure-dependent coefficient βp. For the viscous model, the viscosity is a function of both temperature and pressure. For the viscoelastic K-BKZ model, the time-temperature shifting concept has been used for the non-isothermal calculations, while the time-pressure shifting concept has been used to shift the relaxation moduli for the pressure-dependence effect. It was found that only the viscoelastic simulations were capable of reproducing the experimental data well, while any viscous modeling always underestimates the pressures, especially at the higher apparent shear rates and L/D ratios. en
heal.journalName Society of Plastics Engineers - EUROTEC 2011 Conference Proceedings en

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