On the development of secondary motions in straight channels induced by the second normal stress difference: experiments and simulations

Debbaut, B.; Avalosse, T; Dooley, Joseph M.; Hughes, Kevin R.

doi:10.1016/s0377-0257(96)01543-1

Cited by 103 publications

(64 citation statements)

References 26 publications

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“…The numerical methods used in this study are not as complex as those in (for example) Refs. [1,23,37,43,45,46], and [50]. However, the simpler numerical approach is justified due to the Newtonian, inelastic nature of the PET melts modeled and readily enables the 3D complexity to be accounted for.…”

Section: Methodsmentioning

confidence: 99%

“…An excellent agreement between die plug structures and numerically predicted phase distributions is also shown in Refs. [1,22,37], and [66].…”

Section: Overall Flow Validationmentioning

confidence: 99%

“…For further information on elastic effects in polymer coextrusion (not described in this study), the reader is directed toward Refs. [1,3,13,14,21,23], and [32][33][34][35][36][37]. It is stated in Ref.…”

Section: Introductionmentioning

confidence: 98%

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Numerical modeling of multilayer film coextrusion with experimental validation

2014

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Section: Methodsmentioning

confidence: 99%

“…An excellent agreement between die plug structures and numerically predicted phase distributions is also shown in Refs. [1,22,37], and [66].…”

Section: Overall Flow Validationmentioning

confidence: 99%

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Numerical modeling of multilayer film coextrusion with experimental validation

2014

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“…The secondary flow in a rectangular duct was then studied extensively, for example, using perturbation approximation [37], FVM [38,39], FDM [40] and FEM [41].…”

Section: Fully Developed Flow Of Viscoelastic Fluid In a Square Ductmentioning

confidence: 99%

Computing non-Newtonian fluid flow with radial basis function networks

Mai‐Duy

Tanner

2005

Int. J. Numer. Meth. Fluids

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“…Debbaut et al [1] showed that these motions originate from the combination of second normal stress difference and non-circular geometry. Polymer coextrusion processes involve viscoelastic two-phase flows that influence layer formation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of viscoelastic layer rearrangement in polymer melts using OpenFOAM®

Köpplmayr

Mayrhofer

2015

AIP Conference Proceedings

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Abstract. In addition to their shear-thinning behavior, polymer melts are characterized by first and second normal stress differences, which cause secondary motions. Polymer coextrusion processes involve viscoelastic two-phase flows that influence layer formation. Using polymer melts with different pigmentation makes visible the layers deformed by second normal stress differences. We used a new solver for the OpenFOAM CFD toolbox which handles viscoelastic two-phase flows. A derivative of the volume-of-fluid (VoF) methodology was employed to describe the interface. Different types of polymer melt, such as polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET) were investigated. In a coextrusion process, the less viscous phase usually tends to encapsulate the more viscous one. However, the different viscoelastic properties of the melts also influence interface deformation. The materials were characterized by smallamplitude oscillatory-shear rheometry, and a multimode Giesekus model was used to fit shear viscosity, storage and loss modulus. Our simulations also took interfacial tension into account. Experimental observations and corresponding numerical simulations were found to be in good accordance.

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On the development of secondary motions in straight channels induced by the second normal stress difference: experiments and simulations

Cited by 103 publications

References 26 publications

Numerical modeling of multilayer film coextrusion with experimental validation

Numerical modeling of multilayer film coextrusion with experimental validation

Computing non-Newtonian fluid flow with radial basis function networks

Numerical simulation of viscoelastic layer rearrangement in polymer melts using OpenFOAM®

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