Paper Number
GR8
Session
Gallery of Rheology Contest
Title
Rheological petals
Presentation Date and Time
October 13, 2021 (Wednesday) 6:30
Track / Room
Gallery of Rheology / Ballroom Pre Function
Authors
- Albreiki, Fahed (University of Illinois at Chicago, Chemical Engineering Department)
- Kubinski, Alexander (University of Illinois at Chicago, Chemical Engineering Department)
- Sharma, Vivek (University of Illinois at Chicago, Chemical Engineering)
Author and Affiliation Lines
Fahed Albreiki, Alexander Kubinski and Vivek Sharma
Chemical Engineering Department, University of Illinois at Chicago, Chicago, IL 60607
Speaker / Presenter
Albreiki, Fahed
Keywords
experimental methods; flow-induced instabilities; polymer solutions
Text of Abstract
The displacement of a more viscous fluid by a lower viscosity fluid in quasi-two-dimensional flow created in the so-called Hele-Shaw cell is observed to create complex fingering patterns. In this image, snapshots of two fingering patterns were acquired while maintaining identical experimental conditions but using a Newtonian fluid (red) in the first part and a viscoelastic fluid (blue) in the second part. The comparison reveals that incorporating viscoelasticity alters the growth and evolution of the pattern leading to highly complex petals-shapes and branch-like structures, whereas the Newtonian fluid develops a more stable fingertip growth. The viscoelastic fluid used is a model elastic fluid with a low rate-independent shear viscosity.