Paper Number
CS23 

Session
Colloids and Suspensions

Title
Enhanced hydrodynamics and deformation promoted by confinement in colloidal suspensions

Presentation Date and Time
October 15, 2024 (Tuesday) 11:30

Track / Room
Track 2 / Waterloo 4

Authors (Click on name to view author profile)

  1. Sidong, Tu (Case Western Reserve University, Macromolecular Science and Engineering)
  2. Barcelos, Erika I. (Case Western Reserve University)
  3. Khani, Shaghayegh (Pontifical Catholic University of Rio de Janeiro)
  4. Carvalho, Fellipe C. (Universidade Federal do Rio do Janeiro)
  5. Naccache, Monica F. (Pontificia Universidade Catolica do Rio de Janeiro, Department of Mechanical Engineering)
  6. Maia, Joao (Case Western Reserve University, Macromolecular Science and Engineering)

Author and Affiliation Lines (in printed abstract book)
Tu Sidong1, Erika I. Barcelos1, Shaghayegh Khani2, Fellipe C. Carvalho3, Monica F. Naccache2 and Joao Maia1
1Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106; 2Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil; 3Universidade Federal do Rio do Janeiro, Rio do Janeiro, Brazil

Speaker / Presenter 
Sidong, Tu

Keywords
computational methods; colloids; flow-induced instabilities; non-Newtonian fluids; particles

Text of Abstract
Suspensions are one of the most popular and studied system in the soft matter community, due to the vast range of potential applications that can be obtained by tailoring properties at flow and particle level. Herein, we study hydrodynamic effects induced by particle deformability and confinement in bimodal semi-dense suspensions. Core-Modified Dissipative Particle Dynamics (CM-DPD) is used as a framework to represent the colloids. We evaluate the microstructure and particle arrangements when particle rigidity, flow rate, volume fraction and confinement are systematically varied, in order to obtain an overall understanding on how sustensions behave in confined flow condition. Both rigid and soft particles form clusters in equilibrium; however, soft particles, due to their deformability, experience more contacts, resulting in the formation of larger clusters when flow is applied. Also, the increase of concentration enhances contact formation.