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- W4321208103 abstract "Boundary shape, particularly roughness, strongly controls the amount of wall slip in dense granular flows. In this paper, we aim to quantify and understand which aspects of a dense granular flow are controlled by the boundary conditions, and to incorporate these observations into a cooperative nonlocal model characterizing slow granular flows. To examine the influence of boundary properties, we perform experiments on a quasi-2D annular shear cell with a rotating inner wall and a fixed outer wall; the latter is selected among 6 walls with various roughnesses, local concavity, and compliance. We find that we can successfully capture the full flow profile using a single set of empirically determined model parameters, with only the wall slip velocity set by direct observation. Through the use of photoelastic particles, we observe how the internal stresses fluctuate more for rougher boundaries, corresponding to a lower wall slip, and connect this observation to the propagation of nonlocal effects originating from the wall. Our measurements indicate a universal relationship between dimensionless fluidity and velocity." @default.
- W4321208103 created "2023-02-18" @default.
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- W4321208103 date "2023-01-01" @default.
- W4321208103 modified "2023-09-30" @default.
- W4321208103 title "Controlling rheology <i>via</i> boundary conditions in dense granular flows" @default.
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- W4321208103 doi "https://doi.org/10.1039/d2sm00683a" @default.
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