Paper Number
PO75 

Session
Poster Session

Title
Concentration profiles of particulate suspensions sheared in a Taylor–Couette cell with flat and bumpy rough walls

Presentation Date and Time
October 23, 2019 (Wednesday) 6:30

Track / Room
Poster Session / Ballroom C on 4th floor

Authors (Click on name to view author profile)

1. Sarabian, Mohammad (Ohio University, Mechanical Engineering)
2. Metzger, Bloen (2Aix-Marseille Université, CNRS)
3. Hormozi, Sarah (Ohio University)

Author and Affiliation Lines (in printed abstract book)
Mohammad Sarabian¹, Bloen Metzger², and Sarah Hormozi^3
1Mechanical Engineering, Ohio University, Athens, OH 45701; ²2Aix-Marseille Université, CNRS, Marseille, France; ³Ohio University, Athens, OH 45701

Speaker / Presenter 
Sarabian, Mohammad

Text of Abstract
We experimentally investigate particle migration in a non-Brownian suspension sheared in a Taylor–Couette configuration with flat and rough walls and in the limit of vanishing Reynolds number. Highly resolved index-matching techniques are used to measure the local particulate volume fraction. In this wide-gap Taylor–Couette configuration with flat walls, we find that for a large range of bulk volume fraction the fully developed concentration profiles are well predicted by the suspension balance model of Nott & Brady. Moreover, we provide systematic measurements of the migration strain scale and of the migration amplitude which highlight the limits of the suspension balance model predictions. To study the effect of particle layering on the kinetics and dynamics of migration, the Couette cell is covered by two bumpy rough walls to disrupt the particle clustering happening at larger volume fractions. We find that the migration occurs with a faster rate once the particles don't organize into layers. However, the fully-developed concentration profiles remain unaffected.