Paper Number
GR7 

Session
Gallery of Rheology Contest

Title
Elastic effects in extension with yield-stress fluids

Presentation Date and Time
October 23, 2019 (Wednesday) 6:30

Track / Room
Gallery of Rheology / Main Lobby on 3rd floor

Authors (Click on name to view author profile)

1. Sen, Samya (University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering)
2. Ewoldt, Randy H. (University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering)

Author and Affiliation Lines (in printed abstract book)
Samya Sen and Randy H. Ewoldt
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Speaker / Presenter 
Sen, Samya

Text of Abstract
Elastic effects in yield-stress fluids manifest as thickening behavior under extensional flows when these fluids are modified to be ‘’stretchy’’ in addition to being viscoplastic, in contrast to being shear-thinning. We visualize this unique behavior in a new model material in the class of extensible yield-stress fluids: an aqueous suspension of Carbopol microgel particles and high molecular weight poly(ethyleneoxide) (PEO). This demonstrates the unique ability of extensible yield-stress fluids to hold their shape under low stresses, but form continuous filaments under extensional deformations. Such properties are useful for extensive applications including sprays, jets, and 3D printing.