Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 45: Colloids and Complex Liquids II

CPP 45.5: Vortrag

Donnerstag, 14. März 2013, 16:15–16:30, H40

How elasticity influences the dynamics of bead-spring-chains in shear flow — •Johannes Greber and Walter Zimmermann — LS Theoretische Physik I, Universität Bayreuth,95440 Bayreuth

Simulations of dumbbells in shear flow show that in the semi-diluted regime of a dumbbell suspension individual dumbbells make flips after unpredictable time intervals [1].

With the help of the Fluid Particle Dynamics (FPD) we simulate suspensions of flexible dumbbells corresponding to high Weissenberg numbers Wi and low Reynolds numbers Re [2,3]. We investigate how the flexibility of springs connecting the two beads of a dumbbell (measured by Wi) influences the mixing behaviour in a dumbbell suspension. Further we compare the dynamics of the flow of a dumbbell suspension with the turbulent flow regime in Newtonian fluids at high Reynolds numbers.

References

[1] J. Bammert et al. (preprint)

[2] H. Tanaka and T. Araki, Phys. Rev. Lett. 85, 1338 (2000)

[3] P. Peyla, EPL 80, 34001 (2007)