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- W4366681291 abstract "Using discrete element method simulations, we show that the settling of frictional cohesive grains under ramped-pressure compression exhibits strong history dependence and slow dynamics that are not present for grains that lack either cohesion or friction. Systems prepared by beginning with a dilute state and then ramping the pressure to a small positive value ${P}_{text{final}}$ over a time ${ensuremath{tau}}_{mathrm{ramp}}$ settle at packing fractions given by an inverse-logarithmic rate law, ${ensuremath{phi}}_{text{settled}}({ensuremath{tau}}_{mathrm{ramp}})={ensuremath{phi}}_{text{settled}}(ensuremath{infty})+A/[1+Bmathrm{ln}(1+{ensuremath{tau}}_{mathrm{ramp}}/{ensuremath{tau}}_{mathrm{slow}})]$. This law is analogous to the one obtained from classical tapping experiments on noncohesive grains, but crucially different in that ${ensuremath{tau}}_{mathrm{slow}}$ is set by the slow dynamics of structural void stabilization rather than the faster dynamics of bulk densification. We formulate a kinetic free-void-volume theory that predicts this ${ensuremath{phi}}_{text{settled}}({ensuremath{tau}}_{mathrm{ramp}})$, with ${ensuremath{phi}}_{text{settled}}(ensuremath{infty})={ensuremath{phi}}_{mathrm{ALP}}$ and $A={ensuremath{phi}}_{text{settled}}(0)ensuremath{-}{ensuremath{phi}}_{mathrm{ALP}}$, where ${ensuremath{phi}}_{mathrm{ALP}}ensuremath{equiv}.135$ is the ``adhesive loose packing'' fraction found by Liu et al. [Equation of state for random sphere packings with arbitrary adhesion and friction, Soft Matter 13, 421 (2017)]." @default.
- W4366681291 created "2023-04-24" @default.
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- W4366681291 date "2023-04-21" @default.
- W4366681291 modified "2023-10-18" @default.
- W4366681291 title "Ultraslow Settling Kinetics of Frictional Cohesive Powders" @default.
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- W4366681291 doi "https://doi.org/10.1103/physrevlett.130.166102" @default.
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