Experimental validation of non linear network models

Carrot, Christian; Guillet, Jacques; Revenu, Pascale; Arsac, A.

doi:10.1016/s0169-3107(96)80007-4

Cited by 7 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Konaganti et al 34 highlighted that the effect of Nyz is very limited on the extrudate swell behavior, and therefore, they ignored this effect by considering zero ξi values for the multimode PTT model to describe the rheological properties of the HDPE melt. On the other hand, Carrot et al 14 reported that a real agreement of the extensional and shearing behavior of the polymer melts cannot be achieved by using a single εi or ξi parameter. Also our previous work on PP melts with a fixed aspect ratio indicates that both parameters are needed.…”

Section: Parametric Study Regarding Nonlinear Ptt Parametersmentioning

confidence: 99%

“…13 However, this model cannot capture realistic or nonlinear viscoelastic properties of polymer fluids, such as shear-thinning and elongationthinning behavior in the high strain rate region. 14 Some more realistic constitutive models have therefore been proposed, such as the integral Kaye-Bernstein-Kearsley-Zapas (KBKZ) constitutive model, [15][16][17][18][19] the differential Phan-Thien-Tanner (PTT) model, [20][21][22][23][24][25][26] and the Giesekus model. 25,27 Among them, the integral KBKZ model and the differential PTT model seem suited due to the possibility of describing the shear and elongational properties of polymer melts independently.…”

Section: Introductionmentioning

confidence: 99%

“…25,27 Among them, the integral KBKZ model and the differential PTT model seem suited due to the possibility of describing the shear and elongational properties of polymer melts independently. 14,[28][29][30]…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-dimensional flow simulations for polymer extrudate swell out of slit dies from low to high aspect ratios

et al. 2019

View full text Add to dashboard Cite

The impact of the slit die geometry and the polymer melt flow characteristics on the extrudate swell behavior, which is a key extrusion operating parameter, is highlighted. Three-dimensional (3D) numerical simulations based on the finite element method are compared with their conventional two-dimensional (2D) counterparts at the same apparent shear rates using ANSYS Polyflow software. The rheological behavior is described by the differential multimode Phan-Thien-Tanner constitutive model, with polypropylene as a reference. It is shown that increasing the aspect ratio of the die geometry (width/height ratio variation from 1 to 20) contributes to a significant change in the 3D extrudate deformation (relative changes of 10% in several directions; absolute changes up to 30%) and delays the equilibrium axial position (up to a factor 10). High aspect ratios induce a switch to contract flow (swell ratio <1) for the edge height swell. The 3D extrudate swell strongly deviates from the 2D simplified case due to the die effect near the wall, even for higher aspect ratios. Also a different relation with the material parameters is recorded. The initially large swell behavior is followed by a small shrinkage flow in the middle height direction which cannot be captured by the 2D counterpart. The findings are supported by a comprehensive analysis of the velocity and stress fields in and out of the slit dies.

show abstract

Section: Parametric Study Regarding Nonlinear Ptt Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional flow simulations for polymer extrudate swell out of slit dies from low to high aspect ratios

et al. 2019

View full text Add to dashboard Cite

show abstract

“…MA [22][23][24] Table I summarizes pertinent information about the various materials used. The ABS is an emulsionmade material with a high rubber content (50% ) that has been used in several previous investigat i o n~.~~,~~-~~,~~ The rubber phase has a glass transition temperature, Tg, of -60°C measured by dynamic mechanical analysis at 1 Hz.…”

Section: Introductionmentioning

confidence: 99%

Toughening of nylon 6 with grafted rubber impact modifiers

Keskkula

Paul

1995

J of Applied Polymer Sci

View full text Add to dashboard Cite

SYNOPSISRecent work has shown that nylon 6/acrylonitrile-butadiene-styrene (ABS) blends can be made tough by the addition of some polymer additives that are chemically reactive with nylon 6 and physically compatible with the styrene-acrylonitrile copolymer (SAN) phase of ABS. Imidized acrylic polymers (IA) represent a successful example of such additives that improve the dispersion of ABS in the nylon 6 matrix and render the blends tough. This article examines the possibility of toughening nylon 6 with ethylene/propylene/diene elastomer grafted with SAN copolymer (EPDM-g-SAN). This EPDM-g-SAN consists of 50% rubber and 50% SAN by weight. However, it was found that the same IA that works well to disperse ABS materials of similar rubber content is not as effective for EPDM-g-SAN, primarily because the EPDM forms the continuous phase, not SAN, and, thus, interfaces with nylon 6 during melt blending. Maleated elastomers like maleic anhydride grafted ethylene-propylene copolymer (EPR-g-MA) and styrene-( ethylene-co-buty1ene)-styrene triblock copolymer (SEBS-g-MA) were more effective for dispersing EPDM-g-SAN in the nylon 6 matrix than IA. Various mechanisms that improve the dispersion are discussed. 0 1995 John Wiley & Sons, Inc.

show abstract

“…If both parameters are present in the constitutive structure as is the case of the PTT fluid shear thinning is controlled by both proportionally to the magnitude of the parameters. The numerical values of the constitutive parameters ξ and ε in the PTT model obtained by experimental measurements are usually in the range of ε ∈ [0, 0.5] and ξ ∈ [0, 0.7] for different concentrated industrial materials such as polyethylene (LDPE), molten polyethylene (HDPE) and polyisobutylene (PIB) [40][41][42][43][44] . Moderate values of the parameters are adopted in the present work ε = 0.1 and ξ = 0.05, which is close to the solutions of 2.5% polyisobutylene 40 .…”

Section: B Working Fluidsmentioning

confidence: 99%

Oscillating onset of the Rayleigh–Bénard convection with viscoelastic fluids in a slightly tilted cavity

et al. 2023

View full text Add to dashboard Cite

The oscillating onset of the Rayleigh-Bénard convection (RBC) with viscoelastic fluids in a slightly tilted 2-dimension (2D) rectangular cavity with aspect ratio Γ = 2 was investigated for the first time via direct numerical simulation. A series of simulations were conducted in the plane of the Rayleigh number (Ra) and the tilt angle (α ∈ [0◦,5◦]) with three Weissenberg numbers (Wi = (0.1,0.15,0.2)) at a fixed Prandtl number Pr = 7.0. The evolutionary path of the oscillating convection onset in the (Wi,α)-plane was determined and corresponding complex flow structures were observed. The inclination of the box delays the onset of the oscillations and the corresponding Rayleigh number Rac as compared to the horizontal configuration. Oscillating flow structures acquire the attributes of a traveling wave. A specific feature of the oscillating convection in the case of the horizontal cavity, the periodicity in space and time exists in the inclined box case as well. But, the evolution of the oscillatory flow structure is very different from the horizontal case in that the counter-clockwise cell assimilates the clockwise cell.

show abstract

Experimental validation of non linear network models

Cited by 7 publications

References 56 publications

Three-dimensional flow simulations for polymer extrudate swell out of slit dies from low to high aspect ratios

Three-dimensional flow simulations for polymer extrudate swell out of slit dies from low to high aspect ratios

Toughening of nylon 6 with grafted rubber impact modifiers

Oscillating onset of the Rayleigh–Bénard convection with viscoelastic fluids in a slightly tilted cavity

Contact Info

Product

Resources

About