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Rheology of Periodically Sheared Suspensions Undergoing Reversible-irreversible Transition by Ge, Zhouyang; Elfring, Gwynn J. is a scholarly article available to read on EtoBox.

What is Rheology of Periodically Sheared Suspensions Undergoing Reversible-irreversible Transition about?

The rheology of non-colloidal suspensions under cyclic shear is studied numerically. The main findings are a strain amplitude ($\gamma_0$) dependent response in the shear stress and second normal stress difference ($N_2$). Specifically, we find a reduced viscosity, an enhanced intracycle shear thinning, the onset of a finite $N_2$ and its frequency doubling, all near a critical strain amplitude $\gamma_c$ that scales with the volume fraction $\phi$ as $\gamma_c \sim \phi^{-2}$. These rheological changes also signify a reversible-irreversible transition (RIT), dividing stroboscopic particle dynamics into a reversible absorbing phase (for $\gamma_0<\gamma_c$) and a persistently diffusing phase (for $\gamma_0>\gamma_c$). We explain the results based on two flow-induced mechanisms and elucidate their connection in the context of RIT through the underlying microstructure, which tends towards hyperuniformity near $\gamma_0=\gamma_c$. Overall, we expect this correspondence between rheology and emergent dynamics to hold in a wide range of settings where structural organizations are dominated by volume exclusions.

Author

Ge, Zhouyang; Elfring, Gwynn J.

Published

2022

Language

EN