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Tumbling motion of a single chain in shear flow: a crossover from Brownian to non-Brownian behavior

We present numerical results for the dynamics of a single chain in steady shear flow. The chain is represented by a bead-spring model, and the smoothed profile method is used to accurately account for the effects of thermal fluctuations and hydrodynamic interactions acting on beads due to host fluids. It is observed that the chain undergoes tumbling motions and that its dimensionless frequency F depends only on the Peclet number Pe with a power law. The exponent of Pe clearly changes from 2/3 to 1 around the critical Peclet number, indicating that the crossover reflects the competition of thermal fluctuation and shear flow. The presented numerical results agree well with our theoretical analysis based on Jeffery's work.

preprint2010arXivOpen access
Hideki KobayashiRyoichi Yamamoto
cond-mat.soft
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Hideki KobayashiRyoichi Yamamoto

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