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Vinay Kumar, Behzad Nazari, Douglas Bousfield, Martti Toivakka
Rheology of microfibrillated cellulose suspensions in pressure-driven flow
Appl. Rheol. 26:4 (2016) 43534 (11 pages)
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Rheology of Microfibrillated Cellulose (MFC) suspensions is useful for designing equipment to transport, mix, or process them.
Pressure-driven flow behavior is particularly important for MFC suspensions if they are to be pumped, extruded or coated.
Herein, we report use of slot and pipe geometries for determination of MFC suspension rheology and compare the results to
boundary-driven flows. MFC flow behavior in a slot with varying gaps was studied at mass concentrations of 1, 2, and 3% and
up to shear rates of 100 000 s-1. The suspensions exhibited yield stress and were highly shear thinning (pseudo-plastic) with
apparent power law indices of 0.22 – 0.43. The shear thinning behavior can be explained by a microstructural picture in which
a non-yielding center plug is surrounded by a yielded layer and a fiber-depleted water rich boundary layer.
► Cite this publication as follows:
Kumar V, Nazari B, Bousfield D, Toivakka M: Rheology of microfibrillated cellulose suspensions in pressure-driven flow, Appl. Rheol. 26 (2016) 43534.
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