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Microstructure and thickening of dense suspensions under extensional and shear flows

Published online by Cambridge University Press:  27 July 2017

Ryohei Seto Open the ORCID record for Ryohei Seto [Opens in a new window] ,
Giulio G. Giusteri Open the ORCID record for Giulio G. Giusteri [Opens in a new window]  and
Antonio Martiniello
Ryohei Seto*
Affiliation:
Mathematical Soft Matter Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
Giulio G. Giusteri
Affiliation:
Mathematical Soft Matter Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
Antonio Martiniello
Affiliation:
Mathematical Soft Matter Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
*
†Email address for correspondence: setoryohei@me.com
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Abstract

Dense suspensions are non-Newtonian fluids that exhibit strong shear thickening and normal stress differences. Using numerical simulation of extensional and shear flows, we investigate how rheological properties are determined by the microstructure that is built under flows and by the interactions between particles. By imposing extensional and shear flows, we can assess the degree of flow-type dependence in regimes below and above thickening. Even when the flow-type dependence is hindered, non-dissipative responses, such as normal stress differences, are present and characterise the non-Newtonian behaviour of dense suspensions.

JFM classification

Non-Newtonian Flows: Rheology Low-Reynolds-number flows: Stokesian dynamics Complex Fluids: Suspensions

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Type
Rapids
Information
Journal of Fluid Mechanics , Volume 825 , 25 August 2017 , R3
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Copyright
© 2017 Cambridge University Press 

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