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- W3105509898 abstract "<p>We investigate numerically high speed granular flows down inclines. Recent numerical works have<br>highlighted that the presence of lateral frictional walls allows to produce novel Steady and Fully<br>Developed (SFD) flow regimes at high angle of inclination where accelerated regimes are usually<br>expected (Brodu et al., 2015). These SFD regimes present non-trivial features, including secondary flows<br>with longitudinal vortices and &#8220;supported&#8220; flows characterized by a central and dense core supported by<br>a very agitated dilute layer.<br>We present a review of these new regimes and provide their domain of existence in the parameter space<br>including the mass hold-up M, the inclination angle &#952; and the gap width between the lateral walls. We<br>also investigate the sensitivity of these states to the mechanical parameters of particles such as the<br>restitution coefficient e for binary collisions.<br>We emphasize two salient outcomes. (I) First, our simulations reveal that the emergence of the<br>supported flows is favored by low restitution coefficient (i.e., high dissipation). Surprisingly, increasing<br>the dissipation leads to faster flows. This is explained by a contraction of the flow, resulting in a lower<br>contribution of the side-wall friction. (ii) Second, despite the diversity of the supported flow regimes, the<br>simulations bring to the light that the mass flow rate Q obeys a simple scaling law with the mass hold-up<br>and the gap width: Q~M3/4W1/4.<br>Bibliography<br>Brodu et al., 2015, Journal of Fluid Mechanics, 2015, 769, 218-228</p>" @default.
- W3105509898 created "2020-11-23" @default.
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- W3105509898 date "2020-03-23" @default.
- W3105509898 modified "2023-09-28" @default.
- W3105509898 title "High speed granular flows down inclines" @default.
- W3105509898 doi "https://doi.org/10.5194/egusphere-egu2020-22050" @default.
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