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Rheology of pulp suspensions using ultrasonic Doppler velocimetry

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Abstract

Conventional rheometry coupled with local velocity measurements (ultrasonic Doppler velocimetry) are used to study the flow behaviour of various commercial pulp fibre suspensions at fibre mass concentrations ranging from 1 to 5 wt.%. Experimental data obtained using a stress-controlled rheometer by implementing a vane in large cup geometry exhibits apparent yield stress values which are lower than those predicted before mainly due to existence of apparent slip. Pulp suspensions exhibit shear-thinning behaviour up to a high shear rate value after which Newtonian behaviour prevails. Local velocity measurements prove the existence of significant wall slippage at the vane surface. The velocimetry technique is also used to study the influence of pH and lignin content on the flow behaviour of pulp suspensions. The Herschel–Bulkley constitutive equation is used to fit the local steady-state velocity profiles and to predict the steady-state flow curves obtained by conventional rheometry. Consistency between the various sets of data is found for all suspensions studied, including apparent yield stress, apparent wall slip and complete flow curves.

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Acknowledgements

The authors would like to acknowledge NSERC for the collaborative grant (CRDPJ 379851).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada

    Babak Derakhshandeh, Savvas G. Hatzikiriakos & Chad P. J. Bennington

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  1. Babak Derakhshandeh
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  2. Savvas G. Hatzikiriakos
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  3. Chad P. J. Bennington
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Correspondence to Savvas G. Hatzikiriakos.

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Chad P. J. Bennington, deceased.

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Derakhshandeh, B., Hatzikiriakos, S.G. & Bennington, C.P.J. Rheology of pulp suspensions using ultrasonic Doppler velocimetry. Rheol Acta 49, 1127–1140 (2010). https://doi.org/10.1007/s00397-010-0485-2

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  • DOI: https://doi.org/10.1007/s00397-010-0485-2

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