Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session F40: DFD I
8:00 AM–11:00 AM,
Tuesday, March 5, 2024
Room: 103F
Sponsoring
Unit:
DFD
Chair: Anushka Anushka, IIT Kharagpur
Abstract: F40.00007 : Surface instability during the extrusion of viscoelastic gels*
9:12 AM–9:24 AM
Presenter:
Jonghyun Hwang
(Princeton University)
Authors:
Jonghyun Hwang
(Princeton University)
Mariana Altomare
(Princeton University)
Howard A Stone
(Princeton University)
In this presentation, we will present a new mechanism that can create surface instabilities during extrusion-type flows. In particular, we found that when an ultra-soft viscoelastic gel (G = O(1-10) Pa) is extruded in a cylindrical annular channel, the front of the fluid spontaneously deforms and develops a periodic surface structure at some critical distance along the channel. During the extrusion of the material, the free surface manifests a cascade of different surface instabilities. Initially, a wrinkle-like instability occurs, then fingers with cusped edges start to grow. This crease-like structure then undergoes stress relaxation behavior as the material flows in the channel. We will present the experimental setup, introduce important parameters in the system, and discuss how different parameters affect this cascade of surface instabilities during the gel flow in an annular channel. Lastly, we will also discuss the potential cause and mechanism of this instability.
*This work was supported by the Princeton Center for Complex Materials and MRSEC (NSF DMR-2011750). J. H. acknowledges Kwanjeong Educational Foundation.
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