Double concentric cylinder geometry with slotted rotor to measure the yield stress of complex systems: A numerical study

Based on the success of the slotted plate device [Zhu et al. , “A slotted plate device for measuring yield stress,” J. Rheol. 45, 1105–1122 (2001)] a numerical analysis is performed for a double concentric cylinder geometry with slotted rotor to measure the yield stress of complex systems such as su...

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Bibliographic Details
Published in:Journal of rheology (New York : 1978) 2008-07, Vol.52 (4), p.913-922
Main Authors: Zhu, H., De Kee, D.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
FEM
Physics
Rheological measurements
Rheology
Slotted double concentric cylinder
Techniques and apparatus
Yield stress
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Summary:Based on the success of the slotted plate device [Zhu et al. , “A slotted plate device for measuring yield stress,” J. Rheol. 45, 1105–1122 (2001)] a numerical analysis is performed for a double concentric cylinder geometry with slotted rotor to measure the yield stress of complex systems such as suspensions. This method overcomes the wall-slip problem, it also takes advantage of the amenable features of commercial rheometers. A finite element model is developed to simulate the deformation and stress distribution in the double concentric cylinder geometry under various wall and material interactions (no-slip, 50% slip, and free slip conditions). Our numerical results show that this geometry greatly reduces the wall slip effect and it proves to be a promising technique for measuring the yield stress of complex systems.
ISSN:0148-6055
1520-8516
DOI:10.1122/1.2936073