Ceramics-Silikáty 53, (4) 283 - 286 (2009) |
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RHEOMETRY OF CONCENTRATED CERAMIC SUSPENSIONS- STEPS FROM MEASURED TO RELEVANT DATA -
PART 3: ROTATIONAL VISCOMETER WITH PARALLEL PLATES, POWER-LAW MODEL
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Andertová Jana 1, Rieger František 2
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1 Institute of Chemical Technology Prague, Department of Glass and Ceramics,
Technická 5, 166 28 Prague, Czech Republic
2 Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering,
Technická 4, 166 07 Prague, Czech Republic
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Keywords: Rheology, Rheometry, Ceramics, Suspensions, Viscometer, Parallel plates, Rheological models, Power-law model
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The knowledge of flow behavior of ceramic suspensions is important condition for control of ceramic wet processing. The
flow behavior can be stated by the rheological measurements. The aim of the measurements was to obtain the flow curve and
to propose suitable and simple rheological model for the flow behavior description. The power-law is the simplest model
mostly used for description of rheological behavior of non-Newtonian fluids. Using this model, the dependence of shear
stress τ on shear rate γ˙ can be expressed by the relation: τ = Kγ˙n
, where K is the coefficient of consistency and n stands for
the flow behavior index. The two arrangements of rotational viscometer method with parallel plates (discs) were used in
rheological measurements for results checking. The procedure of experimental data evaluation from rotational viscometer
with parallel plates to obtain parameters K and n is presented. |
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