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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Complex Fluids and Soft Matter (joint session DY/CPP)
CPP 51.2: Talk
Friday, March 22, 2024, 09:45–10:00, BH-N 243
orientational order and topological defects in a dilute solutions of rodlike polymers at low reynolds number — •Leonardo Puggioni1,2, Stefano Musacchio1, and Guido Boffetta1 — 1Dipartimento di Fisica and INFN, Università degli Studi di Torino, via P. Giuria 1, 10125 Torino, Italy — 2Instituut-Lorentz, Leiden Institute of Physics, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands
The relationship between the polymer orientation and the chaotic flow, in a dilute solution of rigid rodlike polymers at low Reynolds number, is investigated, by means of direct numerical simulations. It is found that the rods tend to align with the velocity field in order to minimize the friction with the solvent fluid, while regions of rotational disorder are related to strong vorticity gradients, and therefore to the chaotic flow. The "turbulent-like" behavior of the system is therefore associated to the emergence and interaction of topological defects of the mean director field, similarly to active nematic turbulence. The analysis has been carried out both in two and three spatial dimensions.
Keywords: Rodlike polymers; Elastic turbulence; Nematic symmetry; Topological defects; Low Reynolds chaotic flow