Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J37: Rheology I
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 203AB
Chair: William Schultz, University of Michigan
Abstract: J37.00005 : Hardening phenomenon in wormlike micellar solutions
5:27 PM–5:40 PM
Presenter:
Rossana Pasquino
(Università degli Studi di Napoli Federic)
Authors:
Rossana Pasquino
(Università degli Studi di Napoli Federic)
Ilaria Cusano
(Università degli Studi di Napoli Federico II)
Nino Grizzuti
(Università degli Studi di Napoli Federico II)
The frequency sweep tests revealed different viscoelasticity levels and morphologies, depending on surfactant and salt levels. For the more entangled systems, the transient behavior in shear flow was investigated through startup measurements, performed at different shear rates, covering a wide range of Weissenberg (Wi) numbers. During the transient regime, some samples show flow instabilities and strain hardening phenomena at Wi>1, other solutions do not, behaving like ordinary linear polymers in fast shear flows2,3.
We tried to rationalize this behavior, by identifying the most important parameters, i.e. number of entanglements, characteristic micellar lengths, relaxation times etc., and by clarifying their role in the transient dynamics. A possible mechanism for the onset of flow singularities, related to the scission energy of the wormlike micelles, is suggested and discussed4.
1 T. H. Ito et al, Langmuir 30, 11535 (2014).
2 Inoue et al, Langmuir 21, 1201 (2005).
3 S. Costanzo et al, Macromolecules 49, 392 (2016).
4 R. Pasquino et al, J. Rheol. 67, 353 (2023).
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700