Effect of fluid viscoelasticity on the draw resonance dynamics of melt spinning

Lee, Joo Sung; Jung, Hyun Wook; Kim, Sung Hyun; Hyun, Jae Chun

doi:10.1016/s0377-0257(01)00111-2

Cited by 32 publications

(29 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2, where the cross-sectional areas and the the spinline tensions of the fibre at the take-up position (z = 1) have been plotted against time for two different values of α representing extension thickening (α = 0.2) and extension thinning (α = 0.8) fluids. We observe that consistent with results reported by Lee [13], increase in viscoelasticity increases stability for extension thickening fluids and it decreases stability for extension thinning fluids. In their work they explained that stability depended on the spinline tension sensitivity.…”

Section: Results Of Numerical Simulation and Discussionsupporting

confidence: 93%

“…In the extension thinning case (α = 0.8), increase in De results in lower tension but with increasing amplitude of the oscillations of the spinline tension showing unstable behaviour. For a detailed description of the physics behind the mechanism of draw resonance please refer to [13]. Moreover, from Eq.…”

Section: Results Of Numerical Simulation and Discussionmentioning

confidence: 99%

“…The motivation of this section is based on the studies done by Lee et al [13], on the effect of fluid viscoelasticity on stability of the spinning process. They conducted their studies using White-Metzner and PTT fluids.…”

Section: Qualitative Behaviour Of Giesekus Fluid As a Function Of Thementioning

confidence: 99%

“…This is done by simulating the complete system of nonstationary melt spinning equations with perturbed boundary conditions for different values of the Deborah number (De). The effect of viscoelasticity on the spinning process has been studied previously by Lee et al, [13]. White Metzner and PTT fluids were used in their studies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Stationary Solutions of Viscoelastic Melt Spinning Equations and Stability With Respect to Increasing Viscoelasticity

Dhadwal

Kudtarkar

2010

Mathematical Modelling and Analysis

View full text Add to dashboard Cite

Abstract. The one-dimensional equations governing the formation of viscoelastic fibers using Giesekus constitutive equation were studied. Existence and uniqueness of stationary solutions was shown and relation between the stress at the spinneret and the take-up velocity was found. Further, the value of the Giesekus model parameter for which the fibre exhibits Newtonian behaviour was found analytically. Using numerical simulations it was shown that below this value of the parameter the fluid shows extension thickening behaviour and above, extension thinning. In this context, by simulating the non-stationary equations the effect of viscoelasticity on the stability of the spinning process was studied.

show abstract

Section: Results Of Numerical Simulation and Discussionsupporting

confidence: 93%

Section: Results Of Numerical Simulation and Discussionmentioning

confidence: 99%

Section: Qualitative Behaviour Of Giesekus Fluid As a Function Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Stationary Solutions of Viscoelastic Melt Spinning Equations and Stability With Respect to Increasing Viscoelasticity

Dhadwal

Kudtarkar

2010

Mathematical Modelling and Analysis

View full text Add to dashboard Cite

show abstract

“…Beris and Liu [15] used Upper-Convected Maxwell (UCM) model to simulate one-dimensional transient ber spinning process and compared the results for the Newtonian and high Deborah number viscoelastic uids. Lee et al [16] used White-Metzner and Phan-Thien-Tanner viscoelastic models to investigate the e ect of viscoelasticity on the draw resonance dynamics. They found that increasing elastic behavior of the uid resulted in stabilizing melt spinning.…”

Section: Introductionmentioning

confidence: 99%

Study on the Viscoelastic Fluid Behavior in Hollow Fiber Membrane Fabrication Process Using Giesekus’ Model

2017

View full text Add to dashboard Cite

Abstract. In the present study, attempts are made to study the behavior of a viscoelastic uid in the hollow ber membrane production process. For this purpose, the uid is considered to obey the Giesekus' model and ow is taken as steady, two-dimensional and isothermal one. The ow eld is obtained using DEVSS/SUPG scheme combined with a free surface tracking method. The obtained results are compared to the case of Newtonian uid. It is shown that the extrudate swell is 20% more in the case of viscoelastic uid. Moreover, the elastic behavior of the viscoelastic uid signi cantly a ects the velocity eld in the extrudate outside the die. It causes the uid ow to become reversed in the middle part of the extrudate as the direct result of the stress relaxation process, whereas such a behavior is not seen for Newtonian uid. Also, the First Normal Stress Di erence (FNSD) distribution in the extrudate is obtained and its variation is discussed. Furthermore, the e ects of operational parameters, including die back pressure and take-up velocity, are investigated. Finally, the predicted extrudate swell for various operation conditions is compared to experimental results showing good agreement between experimental and simulated data.

show abstract

Spinning of Poly(Lactic Acid) Fibers

Agrawal¹

2010

Poly(Lactic Acid)

View full text Add to dashboard Cite

A fiber or a filament (a continuous form of fiber) is the fundamental unit of textile materials. It has a unique combination of high strength (tensile, bending, torsional, or compression), high flexibility (i.e., low modulus), extensibility, and shows recoverability on deformation. Most of these properties are observed in one principal direction, which is known as the axis of the fiber. Since all textile structures from one to three dimensional (yarn, fabric, or braids, etc.) are built using this basic structural unit, these structures also possess the above unique properties.These unique properties of a fiber or a filament are the result of a microstructure (morphology) in which the majority of the polymer chains are oriented in the direction of the axis of the fiber. The more oriented the polymer molecules are in this direction, the better properties the resulting fiber/ filament is likely to have. For producing man-made fibers, the polymers (either natural or synthetic) must be unfolded and extended unidirectionally to an extremely large extent resulting in a very high aspect (length to diameter) ratio and high orientation. This is known as spinning.In spinning, a small amount of polymer ($1 g) may be elongated to over 9000 m in length while the other dimension (diameter) is only in microns. This requires precise control over the spinning process to enable such unidirectional extension in the melt form. In fiber formation, all efforts are directed at controlling the microstructure of the polymer so that the properties mentioned above are obtained with respect to the principal axis of the fiber. This is unlike other polymer processing methods such as injection molding, compression molding, extrusion, and blowing, and so on, where mostly isotropic properties are desired and only a little attention is directed toward making a controlled microstructure in terms of molecular orientation and spatial arrangement. The engineering complexity of the spinning operation is evident from the fact that, in modern spinning plants, a large amount of polymer is expected to be continuously converted (spun) into filaments with nearly no breaks.In spinning, polymer melt or solution is extruded from a fine hole and is elongated by applying a external tensile force on the extruded portion. As the polymer melt or solution is pulled, it is cooled or precipitated, respectively, to form a solid filament. This filament is then usually subjected to post-spinning operations such as drawing, which applies unidirectional stretching to the material in a semisolid form, and heat setting, which is crystallization to equilibrium. Other post-spinning processes such as texturing are simply variations of the drawing and heat setting processes to impart curvilinear shape to an otherwise straight filament. This gives physical bulk to the filaments. The process of fiber formation is complete only when both spinning and post-spinning operations are carried out. MELT SPINNING LINEMelt spinning is a process of producing filaments from a polymer melt. Ho...

show abstract

Effect of fluid viscoelasticity on the draw resonance dynamics of melt spinning

Cited by 32 publications

References 14 publications

Investigation of Stationary Solutions of Viscoelastic Melt Spinning Equations and Stability With Respect to Increasing Viscoelasticity

Investigation of Stationary Solutions of Viscoelastic Melt Spinning Equations and Stability With Respect to Increasing Viscoelasticity

Study on the Viscoelastic Fluid Behavior in Hollow Fiber Membrane Fabrication Process Using Giesekus’ Model

Spinning of Poly(Lactic Acid) Fibers

Contact Info

Product

Resources

About