TY - JOUR
T1 - Microstructure and thickening of dense suspensions under extensional and shear flows
AU - Giusteri, Giulio Giuseppe
AU - Seto, Ryohei
AU - Giusteri, Giulio G.
AU - Martiniello, Antonio
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - rheology, Stokesian dynamics, suspensions
KW - rheology, Stokesian dynamics, suspensions
UR - http://hdl.handle.net/10807/104556
U2 - 10.1017/jfm.2017.469
DO - 10.1017/jfm.2017.469
M3 - Article
SP - N/A-N/A
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -