TY  - JOUR
AU  - Huang, Chien-Cheng
AU  - Gompper, Gerhard
AU  - Winkler, Roland G.
TI  - Non-equilibrium relaxation and tumbling times of polymers in semidilute solution
JO  - Journal of physics / Condensed matter
VL  - 24
IS  - 28
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2012-00332
SP  - 284131
PY  - 2012
AB  - The end-over-end tumbling dynamics of individual polymers in dilute and semidilute solutions is studied under shear flow by large-scale mesoscale hydrodynamic simulations. End-to-end vector relaxation times are determined along the flow, gradient, and vorticity directions. Along the flow and gradient directions, the correlation functions decay exponentially with sinusoidal modulations at short times. In dilute solution, the decay times of the various directions are very similar. However, in semidilute solutions, the relaxation behaviors are rather different along the various directions, with the longest relaxation time in the vorticity direction and the shortest time in the flow direction. The various relaxation times exhibit a power-law shear-rate dependence with the exponent  − 2/3 at high shear rates. Quantitatively, the relaxation times are equal to the tumbling times extracted from cross-correlation functions of fluctuations of radius-of-gyration components along the flow and gradient direction.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000305786400033
DO  - DOI:10.1088/0953-8984/24/28/284131
UR  - https://juser.fz-juelich.de/record/127332
ER  -