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- W2089665655 abstract "Abstract The tumbling dynamics of flexible chains in shear flow, analysed by Brownian Dynamics simulations, are found to be ruled by three characteristic times τ tumb , τ dif and τ lag . The average tumbling time τ tumb scales with the shear rate with a robust exponent against excluded volume (EV) or hydrodynamic interactions, $tau _{{rm tumb}} approx {dot {gamma }}^{{-} 2/3} $ . The chain extensions in the flow plane decorrelate in a time τ dif determined by the diffusion of the chain configuration in gradient direction, $tau _{{rm dif}} approx Y^{2} /D$ . The chain keeps memory of its configuration over a number of tumblings events given by the ratio τ dif / τ tumb . While for ideal chains $tau _{{rm dif}} /tau _{{rm tumb}} approx O(1)$ , for expanded (EV) chains we find $tau _{{rm dif}} /tau _{{rm tumb}} approx {dot {gamma }}^{0.2} $ . Hence, EV chains tumble in a more deterministic way as ${dot {gamma }}$ is increased. As a consequence, contrary to previous assumptions, the exponential tail of the tumbling time distribution $P(tau )approx {exp} ({-} nu tau )$ presents a non‐Poissonian exponent. This exponent ν is found to be determined by a new characteristic time τ lag measuring how fast the chain in‐flow elongation X responses to the drag force induced by chain fluctuations in gradient direction Y . PSCS numbers. magnified image" @default.
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- W2089665655 date "2011-07-22" @default.
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- W2089665655 title "Characteristic Times of Polymer Tumbling Under Shear Flow" @default.
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