Paper Number
PO18 

Session
Poster Session

Title
Elastic instabilities in confined geometries

Presentation Date and Time
October 13, 2021 (Wednesday) 6:30

Track / Room
Poster Session / Ballroom 1-2-3-4

Authors (Click on name to view author profile)

1. Kumar, Manish (Purdue University, School of Mechanical Engineering)
2. Ardekani, Arezoo M. (Purdue University, Mechanical Engineering)

Author and Affiliation Lines (in printed abstract book)
Manish Kumar and Arezoo M. Ardekani
Mechanical Engineering, Purdue University, west lafayette, IN 47906

Speaker / Presenter 
Kumar, Manish

Keywords
confined flows; flow-induced instabilities; non-Newtonian fluids; polymer solutions

Text of Abstract
Polymeric flow through confined geometries is relevant in industrial applications such as enhanced oil recovery, microbial mining, groundwater remediation, and biological processes such as drug delivery, particles and cells transport during respiration and fertilization. Large elastic stresses induced due to confined geometries lead to elastic instabilities in the viscoelastic flows. We study viscoelastic instabilities in the confined geometries made of series of expansion-contraction obstacles and cylinders. The accumulation of polymeric stress as polymeric chains advect through closely placed obstacles creates strands of high polymeric stress. These strands act as a barrier for the flow crossing the regions, which leads to flow separation and formation of multiple flow states. The formation of strands of polymeric stress regulates the macroscopic transport of fluid and particles in realistic porous media.