The apparent yield stress of pulp fiber suspensions

Derakhshandeh, Babak; Hatzikiriakos, Savvas G.; Bennington, C. P. J.

doi:10.1122/1.3473923

Cited by 57 publications

(40 citation statements)

References 36 publications

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“…Apparent yield stresses were determined from the flow curve at shear rates 20-502.4 1/s using the Herschel-Bulkley calculation (Herschel and Bulkley 1926;Barnes 1999) which has been used earlier for pulp fiber suspensions (Derakhshandeh et al 2010) and MFC suspensions (Lowys et al 2001). The Herschel-Bulkley equation is presented below:…”

Section: Rheological Measurementsmentioning

confidence: 99%

“…In that region, the suspension is certainly at the state that it flows. The validity of the yield stress concept has been under debate (Barnes 1999;Derakhshandeh et al 2010;Masalova et al 2008). We agree that the obtained value is dependent on determination method and therefore comparable rather than absolute material characteristic.…”

Section: Apparent Yield Stressmentioning

confidence: 99%

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Effect of cationic polymethacrylates on the rheology and flocculation of microfibrillated cellulose

et al. 2011

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Section: Rheological Measurementsmentioning

confidence: 99%

Section: Apparent Yield Stressmentioning

confidence: 99%

Effect of cationic polymethacrylates on the rheology and flocculation of microfibrillated cellulose

et al. 2011

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“…For example, the development of the probability function including the effect of the yield stress of pulp fiber suspensions reported in experimental studies [3] will be a first step of the further study.…”

Section: Resultsmentioning

confidence: 99%

Modeling of a Floc-Forming Fluid Using a Reversible Network Model

Yamamoto

2014

J. Text. Eng.

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A reversible network model was applied to a model for a floc-forming fluid such as a pulp suspension. The reversible network model approximately represents the evolution of polymer network structures using non-interacting elastic dumbbells that have two states, active and dangling. The former corresponds to a network segment whose both ends connect to the network, while the latter corresponds to a network segment that its one end dissociates from the network. The transition between the active and the dangling states is stochastically simulated according to probability functions. In the present study, the repetition of forming and breakup of flocs in a flow was modeled by the reversible network model, and the model was examined by evaluating rheology of the model fluid and by simulating its Poiseuille flow in a circular tube. The predictions confirmed that the present model was appropriate for a model of floc-forming fluids.

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“…Although the wall slip problem may be minimised by using rough surfaces, such as sand paper or serrated plates, this approach still includes the difficulties associated with sample loading (Derakhshandeh et al 2010a;2010b). Due to the above limitations, Barnes et al (1990) proposed the use of a vane-in-cup configuration to avoid the wall slip, which was adopted in this work.…”

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 apparent yield stress of pulp fiber suspensions

Cited by 57 publications

References 36 publications

Effect of cationic polymethacrylates on the rheology and flocculation of microfibrillated cellulose

Effect of cationic polymethacrylates on the rheology and flocculation of microfibrillated cellulose

Modeling of a Floc-Forming Fluid Using a Reversible Network Model

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

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