Measurement and simulation of low‐density polyethylene extrudate swell through a circular die | Zendy

Mu Yue | Zendy; Zhao Guoqun | Zendy; Li Huiping | Zendy; Liu Jie | Zendy; Xu Xingming | Zendy; Mu Wenbo | Zendy; Chen Anbiao | Zendy

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Measurement and simulation of low‐density polyethylene extrudate swell through a circular die

Author(s) -

Mu Yue,

Zhao Guoqun,

Li Huiping,

Liu Jie,

Xu Xingming,

Mu Wenbo,

Chen Anbiao

Publication year - 2009

Publication title -

polymer international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.592

H-Index - 105

eISSN - 1097-0126

pISSN - 0959-8103

DOI - 10.1002/pi.2551

Subject(s) - die swell , low density polyethylene , swell , materials science , mechanics , viscoelasticity , rheology , flow (mathematics) , die (integrated circuit) , melt flow index , rheometer , swelling , composite material , polyethylene , polymer , thermodynamics , extrusion , physics , copolymer , nanotechnology

BACKGROUND: Extrudate swell is a common phenomenon in polymer processing. The investigation of its mechanism is of both scientific and industrial interest. RESULTS: The rheological parameters of a material described by the viscoelastic PTT (Phan‐Thien–Tanner) constitutive model are obtained by fitting the distributions of material functions detected with a strain‐controlled rheometer. The swelling ratios of low‐density polyethylene (LDPE) under different volume flow rates are indirectly obtained using a photographic technique. A mathematical model of extrudate swell is established and its finite element model is derived. A penalty method is employed to solve the extrudate swell problem with a decoupled algorithm. Computation stability is improved by using the discrete elastic‐viscous split stress algorithm incorporating the inconsistent streamline‐upwind scheme. CONCLUSION: The swell phenomenon of LDPE through a circular die is investigated using both experimental measurement and numerical simulation. The swelling ratios obtained from the simulation are compared with those measured: they agree well with each other. The essential flow characteristics of polymer melts are predicted and the mechanism of the swell phenomenon is further discussed. Copyright © 2009 Society of Chemical Industry

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