An experimental determination of the stress–microstructure relationship in semi-concentrated fiber suspensions

Petrich, Michael P.; Koch, Donald L.; Cohen, Claude

doi:10.1016/s0377-0257(00)00172-5

Cited by 109 publications

(59 citation statements)

References 34 publications

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“…The elastic modulus was found to be almost an order of magnitude larger than the viscous modulus and weakly dependent on frequency. Finally, it has been found that the rheological behavior of synthetic fiber suspensions shows "shear-thinning", and a complex viscosity tending toward a Newtonian plateau at high frequencies (Petrich et al 2000;Keshtkar et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

2016

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The viscoelasticity of pulp suspensions of bleached sugarcane bagasse was studied in a stress/shear rate-controlled rheometer using concentric cylinders geometry. Results for the elastic (G) and viscous (G) modulus, as well as complex viscosity (*), are presented as a function of the suspension consistency (1.0 wt% ≤ Cm ≤ 6.0 wt%) and temperature (20, 40, and 60 °C). The results show an effect of the concentration and temperature on the viscoelastic moduli and cross-over point. A power law model was fitted to the experimental results for elastic modulus, .  b m G = aC It was found that the complex viscosity exhibited shear-thinning behavior for all the suspensions. Only the pulp concentration had an influence on this material function.

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Section: Introductionmentioning

confidence: 99%

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

2016

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“…In the case of a simple shear flow, the relative viscosity of fibre suspension is given in Eq. (1) (Petrich et al 2000;Stover et al 1992).…”

Section: Introductionmentioning

confidence: 99%

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

2015

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. (2016) The shear viscosity of carbon fibre suspension and its application for fibre length measurement. Rheologica Acta, 55 (1). pp. A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe viscosity of short carbon fibre suspensions in glycerol aqueous solution was measured using a bespoke vane-in-cup viscometer, where the carbon fibre has an aspect ratio from 450 to 2209. In the semi-concentrated regime, nL 3 ranging from 20 to 4400, the suspensions demonstrated strong shear-thinning characteristics particularly at higher concentrations. The shear-thinning characteristic is strongly related to the crowding factor proposed by Kerekes, indicating that non-hydrodynamic interactions occur in the suspensions. The influence of fibre bending on viscosity emerges when the bending ratio is lower than 0.0028. An empirical model based on transient network formation and rupture was proposed and used to correlate the relative viscosity with fibre concentration nL 3 and shear rate. Based on the model, a viscosity method is established to analyse the fibre length by measuring the viscosity of the fibre suspension using a bespoke vane-in-cup viscometer.

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“…The experimental results of Petrich et al (2000) showed that although shear stress increased considerably with fiber concentration, the fiber orientation distribution broadened and then became more uniform, approaching the dilute value at high fiber concentrations, which indicated that the contribution of fiber orientation to shear viscosity was small. They attributed the increase in shear viscosity with increasing fiber concentration to the transmission of stress due to the presence of fiber-fiber contacts.…”

Section: Suspension Viscositymentioning

confidence: 97%

“…In semi-concentrated and concentrated fiber suspensions, mechanical contacts increase fiber-fiber interaction, which increased the frequency of fiber flipping and the orientation distribution. However, Petrich et al (2000) insisted that the contacts first enhance flipping due to collision, as Sundararaj akumar and Koch (1997) simulations indicated, but then decrease flipping when fiber concentration was further increased. When mechanical contacts dominate, the fiber contribution to the rheological characteristics of the suspension became very important.…”

An experimental determination of the stress–microstructure relationship in semi-concentrated fiber suspensions

Cited by 109 publications

References 34 publications

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

Gas holdup in a gas-liquid-fiber semi-batch bubble column

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