Paper Number
GR3
Session
Gallery of Rheology Contest
Title
Viscoelastic promotion of pore-scale commotion
Presentation Date and Time
October 12, 2022 (Wednesday) 6:30
Track / Room
Gallery of Rheology / Sheraton 1
Authors
- Carlson, Daniel W. (Okinawa Institute of Science and Technology)
- Toda-Peters, Kazumi (Okinawa Institute of Science and Technology)
- Shen, Amy Q. (Okinawa Institute of Science and Technology)
- Haward, Simon J. (Okinawa Institute of Science and Technology)
Author and Affiliation Lines
Daniel W. Carlson, Kazumi Toda-Peters, Amy Q. Shen and Simon J. Haward
Okinawa Institute of Science and Technology, Okinawa, Japan
Speaker / Presenter
Carlson, Daniel W.
Keywords
experimental methods; flow-induced instabilities; polymer solutions
Text of Abstract
At micrometre scale, elastic effects can compell viscoelastic flow instability. We leverage volumetric flow measurements through a transparent porous array of 500 micron diameter spheres to 'freeze' the flow of a dilute polymer solution underoing a chaotic instability known as elastic turbulence. Imaging a plane in the array thus casts flow evolution over time as a flow history throughout pore space. In this Gallery of Rheology poster, we present streamlines marking an elastic instability criterion: while diverging streamlines promote streamwise pockets of instability, they also enforce straightened streamlines for pore flow in neighboring pores in crossflow and thus encourage local stability. Evidently the flow history between pores is significant for viscoelastic porous media flow.