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End Effects in Rotational Viscometry I. No-Slip Shear-Thinning Samples in the Z40 DIN Sensor.

SYSNO ASEP	0091179
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	End Effects in Rotational Viscometry I. No-Slip Shear-Thinning Samples in the Z40 DIN Sensor.
Title	Koncové efekty v rotační viskozimetrii I. Měření pseudoplastických vzorků bez skluzu ve viskozimetru Z40 DIN.
Author(s)	Wein, Ondřej (UCHP-M)_{RID, SAI} Večeř, Marek (UCHP-M) Havlica, Jaromír (UCHP-M)_{RID, ORCID, SAI}
Source Title	Rheologica Acta - ISSN 0035-4511 Roč. 46, 5 (2007) , s. 765-772
Number of pages	8 s.
Action	Annual Rheology Conference AERC 2006 /3./
Event date	27.04.2006-29.04.2006
VEvent location	Crete
Country	GR - Greece
Event type	EUR
Language	eng - English
Country	DE - Germany
Keywords	rotational couette flow ; shear-thinning fluids ; end effects
Subject RIV	CI - Industrial Chemistry, Chemical Engineering
R&D Projects	GA104/04/0826 GA ČR - Czech Science Foundation (CSF)
	GP104/06/P287 GA ČR - Czech Science Foundation (CSF)
	GP104/05/P554 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z40720504 - UCHP-M (2005-2011)
Annotation	Neglect of end effects in Couette rotational viscometry introduces 10-30% error in the estimate of shear stress at spindle surface. Actual deviations depend on the shear-thinning level of a given sample. We tackle the end effect for the standard sensor Z40 DIN according to ISO 3219 by solving the related 2D boundary-value problem for a class of shear-thinning viscosity functions. Pseudosimilarity method of treating the primary data leaves an error in shear stresses about 0.5%. Further reduction of the errors needs a full numerical simulation for each point of primary data, based on a suitable wide-range representation of the viscosity function. To support high accuracy of torque calibrations, the effect of inertia on torque for Newtonian liquids in standard sensor Z40 DIN at Re < 500 is calculated using the FLUENT 6.2 commercial software.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2008

Number of the records: 1