Paper Number
IN21 

Session
Flow-induced Instabilities and Non-Newtonian Fluids

Title
Interfacial flows and instabilities of elastic fluids

Presentation Date and Time
October 13, 2021 (Wednesday) 4:10

Track / Room
Track 4 / Meeting Room C-D

Authors (Click on name to view author profile)

1. Albreiki, Fahed (University of Illinois at Chicago, Chemical Engineering Department)
2. Sharma, Vivek (University of Illinois at Chicago, Chemical Engineering)
3. Kubinski, Alexander (University of Illinois at Chicago, Chemical Engineering Department)
4. Rasmussen, Andrew (University of Illinois at Chicago, Chemical Engineering Department)
5. Jelena, Dinic (University of Chicago, Pritzker School of Molecular Engineering)

Author and Affiliation Lines (in printed abstract book)
Fahed Albreiki¹, Vivek Sharma¹, Alexander Kubinski¹, Andrew Rasmussen¹ and Dinic Jelena^2
1Chemical Engineering, University of Illinois at Chicago, Chicago, IL 60607; ²Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637

Speaker / Presenter 
Albreiki, Fahed

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

Text of Abstract
Constant viscosity, but finite elasticity make Boger fluids an ideal choice for investigation of the role and influence of elasticity on interfacial flows and instabilities. In this contribution, we examine the pinching dynamics and extensional rheology response of model Boger fluids using dripping-onto-substrate (DoS) rheometry protocols, showing measurable viscoelastic effects even though elastic properties like modulus and first normal difference are either below the resolution limit of torsional rheometers or source of elastic instabilities. We thereafter show how elasticity influences fingering instability by visualizing flows within Hele-Shaw cell, and discuss the connections with other free surface flows and instabilities where viscoelasticity can influence pattern formation and evolution.