Rheological analysis of stabilizing forces in wire‐coating dies

Tadmor, Z.; Bird, R. Byron

doi:10.1002/pen.760140208

Cited by 71 publications

(29 citation statements)

References 11 publications

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“…Bagley and Storey [14] provided numerical solutions for a Newtonian fluid in the form of dimensionless parameters characterizing the wire speed, die dimensions, radial position, shear rate, and melt viscosity. Tadmor and Bird [15] examined the effect of visco-elasticity on the eccentricity of the wire. Using the Criminale-Ericksen-Filbey (CEF) constitutive equation, they concluded that the lateral forces acting on the wire tend to stabilize it into a concentric position.…”

Section: Introductionmentioning

confidence: 99%

Wire Coating Analysis in MHD Flow and Heat Transfer of a Radiative Third Grade Fluid with Variable Viscosity in a Porous Medium

Nayak¹

2016

AJHMT

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Wire coating process is a continuous extrusion process for primary insulation of conducting wires with molten polymers for mechanical strength and protection in aggressive environments. In the present study wire coating is performed using radiative melt polymer satisfying third grade fluid model. The novelty of this study is to analyze the effect of porosity, thermal radiation parameter and varying temperature dependent viscosity on the wire coating. Reynolds Model and Vogel's Model have been considered to account for temperature dependent viscosity. The equations characterizing the flow and heat transfer phenomena are solved numerically by fourth order Runge-Kutta method and the effects of pertinent parameters are shown with the help of graphs. It is interesting to remark that an increase in non-Newtonian parameter increases the velocity in the absence of porous matrix which coincides with the results reported earlier but in the presence of porous matrix the velocity decreases in the entire span of the flow domain. It is also interesting to note that increase in thermal radiation parameter accelerates the process in the presence of porous matrix. Further, the flow instability in the flows of extrusion die is well marked in case of Vogel's model as pointed out by Nhan-Phan-Thien.

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Section: Introductionmentioning

confidence: 99%

Wire Coating Analysis in MHD Flow and Heat Transfer of a Radiative Third Grade Fluid with Variable Viscosity in a Porous Medium

Nayak¹

2016

AJHMT

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“…Aspect ratios varied from 0.002 to 0.03. The detailed description of the experimental device is found in [5]. Several types of experimental fluids were considered: a) Newtonian: Polybutene Oil (Chevron).…”

Section: Methodsmentioning

confidence: 99%

A note on the translation of a thin rod inside a cylinder

Manero¹,

Mena²,

Vargas³

1987

Rheol Acta

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Abstract." The problem of a thin rod moving longitudinally along the axis of symmetry of a cylindrical vessel is examined for Newtonian and non-Newtonian liquids.For non-Newtonian fluids, the inelastic power-law type solution predicts the experimental results particularly well. On account of wall effects, the induced pressure gradients are much greater for a Newtonian fluid than for a viscoelastic fluid. In fact, in the latter case, they may be considered negligible when the radius of the inner cylinder is small compared to the one of the outer cylinder.

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“…Their work dealt mainly with shear ow under both isothermal and non-isothermal conditions. Molten polymers have been noted to exhibit highly elastic behaviour when subject to large deformation [11]. Only recently, numerical techniques have proven capable of reaching solutions for su ciently high and relevant levels of elasticity: some limited attempts include those of References [12] and [17].…”

Section: Background On Wire-coatingmentioning

confidence: 99%

“…Tadmor and Bird [11] considered the problem of a wire travelling on an axis parallel, but not co-linear to the die. Since the wire was centred with a guider before entering the die, and the wire was under high tension, the problem is more ideal than practical.…”

Section: Background On Wire-coatingmentioning

confidence: 99%

Simulation of pressure‐tooling wire‐coating flow with Phan‐Thien/Tanner models

Ngamaramvaranggul

Webster

2002

Numerical Methods in Fluids

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SUMMARYAnnular pressure-tooling extrusion is simulated for a low density polymer melt using a Taylor-PetrovGalerkin ÿnite element scheme. This represents industrial-scale wire-coating. Viscoelastic uids are modeled via three forms of Phan-Thien=Tanner (PTT) constitutive laws employed for short-die and full speciÿcation pressure-tooling. E ects of variation in Weissenberg number (We) and polymeric viscosity are investigated. Particular attention is paid to mesh reÿnement to predict accurate results. The impact of variation in shear-thinning and strain-softening properties is considered upon the modelling predictions. For the short-die ow, the in uence of the lack of strain softening is identiÿed. For the full-die ow and more severe deformation rates, the linear PTT model failed to converge. In contrast, the exponential PTT model is found to be more stable numerically and to adequately re ect the material response. Comparing short-die and full-die pressure-tooling results, shear rates increase 10-fold, while strain rates increase one hundred times.

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Rheological analysis of stabilizing forces in wire‐coating dies

Cited by 71 publications

References 11 publications

Wire Coating Analysis in MHD Flow and Heat Transfer of a Radiative Third Grade Fluid with Variable Viscosity in a Porous Medium

Wire Coating Analysis in MHD Flow and Heat Transfer of a Radiative Third Grade Fluid with Variable Viscosity in a Porous Medium

A note on the translation of a thin rod inside a cylinder

Simulation of pressure‐tooling wire‐coating flow with Phan‐Thien/Tanner models

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