Laboratory experiments were conducted to study particle migration and flow properties of non-Brownian, noncolloidal suspensions ranging from 10% to 40% particle volume fraction in a pressure-driven flow over and through a porous structure at a low Reynolds number. Particle concentration maps, velocity maps, and corresponding profiles were acquired using a magnetic resonance imaging technique. The model porous medium consists of square arrays of circular rods oriented across the flow in a rectangular microchannel. It was observed that the square arrays of the circular rods modify the velocity profiles and result in heterogeneous concentration fields for various suspensions. As the bulk particle volume fraction of the suspension increases, particles tend to concentrate in the free channel relative to the porous medium while the centerline velocity profile along the lateral direction becomes increasingly blunted. Within the porous structure, concentrated suspensions exhibit smaller periodic axial velocity variations due to the geometry compared to semidilute suspensions (bulk volume fraction ranges from 10% to 20%) and show periodic concentration variations, where the average particle concentration is slightly greater between the rods than on top of the rods. For concentrated systems, high particle concentration pathways aligned with the flow direction are observed in regions that correspond to gaps between rods within the porous medium.
Skip Nav Destination
Particle migration of suspensions in a pressure-driven flow over and through a porous structure
Article navigation
March 2023
Research Article|
March 01 2023
Particle migration of suspensions in a pressure-driven flow over and through a porous structure
Parisa Mirbod
;
Parisa Mirbod
a)
1
Department of Mechanical and Industrial Engineering, University of Illinois
, Chicago, Illinois 60607a)Author to whom correspondence should be addressed; electronic mail: pmirbod@uic.edu
Search for other works by this author on:
Nina C. Shapley
Nina C. Shapley
2
Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey
, Piscataway, New Jersey 08854
Search for other works by this author on:
a)Author to whom correspondence should be addressed; electronic mail: pmirbod@uic.edu
J. Rheol. 67, 417–432 (2023)
Article history
Received:
May 10 2022
Accepted:
November 19 2022
Citation
Parisa Mirbod, Nina C. Shapley; Particle migration of suspensions in a pressure-driven flow over and through a porous structure. J. Rheol. 1 March 2023; 67 (2): 417–432. https://doi.org/10.1122/8.0000505
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Could not validate captcha. Please try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00
219
Views
Citing articles via
Related Content
Effects of particle properties on the rheology of concentrated noncolloidal suspensions
Journal of Rheology (October 1992)
Thermodynamic considerations on the electrorheology of noncolloidal suspensions
Journal of Rheology (May 1996)
Yield stress and elastic modulus of suspensions of noncolloidal particles in yield stress fluids
Journal of Rheology (January 2008)
Oscillatory shear of suspensions of noncolloidal particles
Journal of Rheology (September 2006)
Macroscopic behavior of bidisperse suspensions of noncolloidal particles in yield stress fluids
Journal of Rheology (July 2010)