Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Focus: Soft Particles in Flows II (joint focus session CPP/DY)

CPP 12.9: Vortrag

Montag, 20. März 2017, 17:30–17:45, ZEU 160

Jammed capsules as a model system for soft glassy matter — •Othmane Aouane1, Andrea Scagliarini1, and Jens Harting1,21Forschungszentrum Jülich, Helmholtz Institute Erlangen-Nürnberg, Nürnberg, Germany — 2Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands

Soft-glassy materials describe materials exhibiting a solid-like behavior at rest and local yielding when subject to a high enough stress. While systems like foams, emulsions[1], colloidal and polymer gels have been widely studied in the last decades; still a little is known about the flow behavior of deformable microgels. We investigate numerically the rheology of microgels formed by dense suspensions of capsules under mechanical stress in an athermal system. In a first step, the packing of capsules is done by increasing the size of the scaled deformable particles until reaching the desired size meanwhile the dynamical evolution of the system follows a molecular dynamics-like approach. After the initialization stage and the formation of the microgel structure, we use the lattice Boltzmann method to resolve the fluid motion and the immersed boundary method to couple between the finite element capsules and the fluid [2]. We investigate the existence or not of local yield points by varying the concentration of capsules from 60 to 90%. The effect of elasticity and mechanical forcing are also considered in our study.

[1] Benzi, R., et al. Europhysics Letters, 104.4 (2013): 48006

[2] Krüger, T., et al. Journal of Fluid Mechanics, 751 (2014): 725-745

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