Shear rheometry and visualization of glass fiber suspensions

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Abstract

The nonlinear rheological behavior of short glass fiber suspensions has been investigated in this work by rotational rheometry and flow visualization. A Newtonian and a Boger fluid (BF) were used as suspending media. The suspensions exhibited shear thinning in the semidilute regime and weaker shear thinning in the transition to the concentrated one. Normal stresses and relative viscosity were higher for the BF suspensions than for the Newtonian ones presumably due to enhanced hydrodynamic interactions resulting from BF elasticity. In addition, relative viscosity of the suspensions increased rapidly with fiber content, suggesting that the rheological behavior in the concentrated regime is dominated by mechanical contacts between fibers. Visualization of individual fibers and their interactions under flow allowed the detection of aggregates, which arise from adhesive contacts. The orientation states of the fibers were quantified by a second order tensor and fast Fourier transforms of the flow field images. Fully oriented states occurred for shear rates around 20 s-1. Finally, the energy required to orient the fibers was higher in step forward than in reversal flow experiments due to a change in the spatial distribution of fibers, from isotropic to planar oriented, during the forward experiments. © Springer-Verlag 2009.
Original languageAmerican English
Pages (from-to)177-189
Number of pages158
JournalRheologica Acta
DOIs
StatePublished - 1 Jan 2010

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glass fibers
Glass fibers
visualization
Suspensions
Visualization
glass
shear
fibers
Fibers
shear thinning
Shear thinning
Fluids
fluids
thinning
fluid
Viscosity
viscosity
flow visualization
Flow visualization
Fast Fourier transforms

Cite this

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title = "Shear rheometry and visualization of glass fiber suspensions",
abstract = "The nonlinear rheological behavior of short glass fiber suspensions has been investigated in this work by rotational rheometry and flow visualization. A Newtonian and a Boger fluid (BF) were used as suspending media. The suspensions exhibited shear thinning in the semidilute regime and weaker shear thinning in the transition to the concentrated one. Normal stresses and relative viscosity were higher for the BF suspensions than for the Newtonian ones presumably due to enhanced hydrodynamic interactions resulting from BF elasticity. In addition, relative viscosity of the suspensions increased rapidly with fiber content, suggesting that the rheological behavior in the concentrated regime is dominated by mechanical contacts between fibers. Visualization of individual fibers and their interactions under flow allowed the detection of aggregates, which arise from adhesive contacts. The orientation states of the fibers were quantified by a second order tensor and fast Fourier transforms of the flow field images. Fully oriented states occurred for shear rates around 20 s-1. Finally, the energy required to orient the fibers was higher in step forward than in reversal flow experiments due to a change in the spatial distribution of fibers, from isotropic to planar oriented, during the forward experiments. {\circledC} Springer-Verlag 2009.",
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Shear rheometry and visualization of glass fiber suspensions. / Marín-Santibáñez, Benjamín M.; Pérez-González, José; de Vargas, Lourdes.

In: Rheologica Acta, 01.01.2010, p. 177-189.

Research output: Contribution to journalArticleResearchpeer-review

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