Paper Number
GG36 

Session
Rheology of Gels, Glasses and Jammed Systems

Title
Dynamics of rigid networks in dense suspension flow

Presentation Date and Time
October 12, 2022 (Wednesday) 10:10

Track / Room
Track 3 / Sheraton 5

Authors (Click on name to view author profile)

1. van der Naald, Michael (University of Chicago, Department of Physics)
2. Singh, Abhinendra (The University of Chicago)
3. Jaeger, Heinrich (University of Chicago, Physics)

Author and Affiliation Lines (in printed abstract book)
Michael van der Naald¹, Abhinendra Singh² and Heinrich Jaeger^1
1Department of Physics, University of Chicago, Chicago, IL 60637; ²The University of Chicago, Chicago, IL

Speaker / Presenter 
van der Naald, Michael

Keywords
theoretical methods; computational methods; jammed systems; soil rheology; suspensions

Text of Abstract
Driven dense suspensions can thicken dramatically and even solidify when their concentrations approach their frictional jamming point. Recently, it has been shown that these transitions are driven by the formation of frictional contact networks that constantly form and break under the imposed stress. While multiple studies have used popular network measures to characterize these frictional contact networks, they ignore the underlying physics. Here, we use a network measure originally used in dry granular systems that determines when a frictional contact network or any of the constituent subnetworks are minimally rigid. We study the dynamics of these minimally rigid networks and find that system spanning networks correspond to the highest viscosity shear thickened states. This physics inspired network measure allows us to assess how the isostaticity of the particle contact network impacts the flow and provides a fundamental connection between dense suspensions and dry granular systems.