The flow of dense suspension of non-Brownian particles has been considered by various studies affected by their significance in a variety of industries and natural phenomena. In this study, we investigate the effect of polyhedron morphology on shear thickening, shear jamming, and hysteresis characteristics of non-Brownian suspension of acrylate particles. Particles with the same chemical nature and three different shapes of spherical (aspect ratio Γ = 1), elliptical paraboloid (Γ ≈ 1), and boat-shaped (Γ ≈ 3) are fabricated via photopolymerization-based methods. Studied suspensions show the shear-thinning behavior at low shear stresses and shear thickening behavior at the higher range of shear stress. Also, the strength of observed shear thickening is enhanced for the suspensions of polyhedron particles, which can be attributed to the heightened degree of interparticle frictional contacts. Furthermore, it is found that angularity not only shifts the predicted frictionless and frictional jamming packing fractions to lower values but also expands the shear jamming packing fraction range. Finally, a history-dependent hysteresis is observed in all samples due to the different particle spatial structures forming in ascending and descending flow modes. The observed hysteresis loops strongly depend on the volume fraction and diminish near the jamming packing fraction due to the restricted mobility space of particles. In addition, the tumbling of elongated particles also can decrease the hysteresis loop by enhancing viscosity in the ascending flow mode, where the structures are not fully developed.
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May 2024
Research Article|
April 24 2024
Shear thickening and hysteresis in dense suspensions: The effect of particle shape
M. Mahmoudian
;
M. Mahmoudian
1
Department of Polymer Engineering, Amirkabir University of Technology
, Tehran, Iran
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F. Goharpey
;
F. Goharpey
a)
1
Department of Polymer Engineering, Amirkabir University of Technology
, Tehran, Iran
a)Author to whom correspondence should be addressed. Fax: 98 21 44210498. Electronic mail: goharpey@aut.ac.ir
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M. Behzadnasab
;
M. Behzadnasab
2
Iran Polymer and Petrochemical Institute
, Tehran, Iran
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Z. Daneshfar
Z. Daneshfar
Department of Chemical and Polymer Engineering, Yazd University
, Yazd, Iran
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a)Author to whom correspondence should be addressed. Fax: 98 21 44210498. Electronic mail: goharpey@aut.ac.ir
J. Rheol. 68, 479–490 (2024)
Article history
Received:
December 01 2023
Accepted:
March 28 2024
Citation
M. Mahmoudian, F. Goharpey, M. Behzadnasab, Z. Daneshfar; Shear thickening and hysteresis in dense suspensions: The effect of particle shape. J. Rheol. 1 May 2024; 68 (3): 479–490. https://doi.org/10.1122/8.0000799
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