Suspensions of Semiflexible Fibers in Polymeric Fluids: Rheology and Thermodynamics

Rajabian, Mahmoud; Dubois, Charles; Grmela, Miroslav

doi:10.1007/s00397-005-0434-7

Cited by 71 publications

(52 citation statements)

References 37 publications

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“…Hole cleaning fiber added to the sweep fluid is thought to improve its performance with a negligible increase in viscosity and pressure loss (George et al, 2011). Previous studies (Marti et al, 2005;Rajabian et al, 2005;Guo et al, 2005) showed similar trends, with the apparent viscosity of fiberpolymer suspensions increasing linearly but slightly with increasing fiber concentration up to an approximate critical fiber concentration. At this critical concentration, the apparent viscosity began to increase rapidly and exponentially with only small increases in fiber concentration.…”

Section: Introductionsupporting

confidence: 53%

“…3 and 4) have shown just how sensitive the fiber-fluid is to fluctuations in fiber concentration. Rajabian et al (2005) investigated how the viscosity of fiber suspensions varied with increasing fiber concentration at varying degrees of fiber flexibility. In a similar study, Marti et al (2005) looked into how the viscosity of suspensions of fibers and spheres, respectively, reacted with increasing particle concentration.…”

Section: Rheology Of Fiber Containing Fluidmentioning

confidence: 99%

See 1 more Smart Citation

Stability and Flow Behavior of Fiber-Containing Drilling Sweeps

George¹,

Ahmed²,

Growcock³

2012

Rheology

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Section: Introductionsupporting

confidence: 53%

Section: Rheology Of Fiber Containing Fluidmentioning

confidence: 99%

Stability and Flow Behavior of Fiber-Containing Drilling Sweeps

George¹,

Ahmed²,

Growcock³

2012

Rheology

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“…Experimentally, they found fibers with increased flexibility orientated more slowly than rigid fibers. In this work, they used rheological data to obtain orientation material parameters for an orientation and a stress model combination based on the GENERIC framework of Rajabian et al (2005). This model, applicable for nondilute suspensions, was constructed to supply a mesoscopic level of information pertaining to the fiber microstructure evolution and the resulting stresses within the suspension.…”

Section: Introductionmentioning

confidence: 99%

Using startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose of predicting long fiber orientation

Ortman¹,

Baird²,

Wapperom³

et al. 2012

Journal of Rheology

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SynopsisThe properties of long glass fiber reinforced parts, such as those manufactured by means of injection molding and compression molding, are highly dependent on the fiber orientation generated during processing. A sliding plate rheometer was used to understand the transient stress and orientation development of concentrated long glass fibers during the startup of steady shear flow. An orientation model and stress tensor combination, based on semiflexible fibers, was assessed in its ability to predict fiber orientation when using model parameters obtained from the fits of the stress responses. Specifically, samples of different initial fiber orientations was subjected to the startup of steady shear flow, and an orientation model based on bead and rod theory was coupled with a derived stress tensor that accounts for the semiflexibility of the fibers to obtain the corresponding model parameters. The results showed the semiflexible orientation model and stress tensor combination, overall, provided improved rheological results as compared to the Folgar-Tucker model when coupled with the stress tensor of Lipscomb et al. [J. Non-Newtonian Fluid Mech. 26, 297-325 (1988)]. Furthermore, it was found that both stress tensors required empirical modification to accurately fit the measured data. Finally, orientation models provided encouraging results when predicting the transient fiber orientation for all initial fiber orientations explored. V C 2012 The Society of Rheology. [http://dx

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“…The resulting effects were observed using scanning electron microscopy and dynamic mechanical analysis techniques, and quantified from the measurements of the viscosity in the start-up shear flows and dynamic tests in the linear viscoelastic range. The results are interpreted with the help of a mesoscopic rheological model [13] developed for fiber suspensions in viscoelastic fluids. Furthermore, Férec et al [14] numerically solved the probability distribution function for fiber orientation (Fokker-Planck equation) using a finite volume method.…”

Section: Introductionmentioning

confidence: 99%

Eco-strategy of numerical simulation for fiber assembly orientation in an abrupt planar contraction flow

Chiba

2009

Int J Mater Form

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The objective of the present work is to well understand the mechanism of fiber assembly orientation in various flows involving the processing of composite materials. The evolution of the orientation of fiber assembly in a 4:1 planar contraction flow has been numerically simulated using a computer-friendly-strategy of numerical solution proposed in the work to considerably reduce a computational time: first, fiber suspension flow through a 4:1 planar contraction geometry is numerically simulated on the basis of the co-linear alignment approximation of fibers: secondly, 3-D orientation of a large number of fibers is evaluated by computing the Jeffery equation along the streamlines in the above fiber suspension flow: finally, the evolution of the orientation of fiber assembly can be predicted. The predictions would be feasible for the practical purpose in a fiber composite processing.

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Suspensions of Semiflexible Fibers in Polymeric Fluids: Rheology and Thermodynamics

Cited by 71 publications

References 37 publications

Stability and Flow Behavior of Fiber-Containing Drilling Sweeps

Stability and Flow Behavior of Fiber-Containing Drilling Sweeps

Using startup of steady shear flow in a sliding plate rheometer to determine material parameters for the purpose of predicting long fiber orientation

Eco-strategy of numerical simulation for fiber assembly orientation in an abrupt planar contraction flow

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