Paper Number
DP19                         My Program 

Session
Dense Particulate Systems

Title
Rigid structure development in dense mono- and bidisperse suspensions

Presentation Date and Time
October 15, 2024 (Tuesday) 1:50

Track / Room
Track 3 / Waterloo 5

Authors (Click on name to view author profile)

  1. Morris, Jeffrey F. (CUNY City College of New York, Levich Institute and Dept. of Chemical Engineering)
  2. Orsi, Michel (CUNY City College of New York, Levich Institute)
  3. Pandare, Rahul (CUNY City College of New York, Levich Institute and Dept. of Chemical Engineering)
  4. Santra, Aritra (Indian Institute of Technology, Dhanbad, Dept. of Chemical Engineering)
  5. Shattuck, Mark D. (CUNY City College of New York, Levich Institute and Dept. of Physics)
  6. Chakraborty, Bulbul (Brandeis University, Physics)

Author and Affiliation Lines (in printed abstract book)
Jeffrey F. Morris1, Michel Orsi2, Rahul Pandare1, Aritra Santra3, Mark D. Shattuck4 and Bulbul Chakraborty5
1Levich Institute and Dept. of Chemical Engineering, CUNY City College of New York, New York, NY 10031; 2Levich Institute, CUNY City College of New York, New York, NY 10031; 3Dept. of Chemical Engineering, Indian Institute of Technology, Dhanbad, Dhanbad, Jharkhand, India; 4Levich Institute and Dept. of Physics, CUNY City College of New York, New York, NY 10031; 5Physics, Brandeis University, Waltham, MA 02453

Speaker / Presenter 
Pandare, Rahul

Keywords
theoretical methods; computational methods; dense systems; networks; particualte systems; suspensions

Text of Abstract
Discontinuous shear thickening (DST) in concentrated suspensions occurs when the imposed stress drives particles together to form a frictional contact network. This implies a balancing resisting force, whose magnitude sets the threshold for the imposed stress to induce contacts. Using an established simulation technique [1] that captures these behaviors, we show for a two-dimensional (monolayer) suspension at high shear stress -- in the shear-thickened state -- that the number of contacts in the network is an increasing function of solid fraction, and it necessarily fluctuates during flow. We go on to explore the development of minimally rigid structures in the shear-thickened suspension as it approaches the jamming fraction for frictionally interacting particles, and show that the onset of large rigid clusters exhibits critical behavior that appears to be of the 2D Ising class. The scaling is considered for both monodisperse and bi-disperse suspensions (with bidispersity up to four-to-one size ratio). The relationship of the rheological properties of both shear and normal stresses to the rigid structure development will be discussed. 1. R. Mari, R. Seto, J. F. Morris & M. M. Denn 2014 Shear thickening, frictionless and frictional rheologies. J. Rheol. 58, 1693.