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From Darcy to Gaussian to fully mobilised grain flow in a confined channel

Miles Morgan, Bjornar Sandnes Orcid Logo

EPJ Web of Conferences, Volume: 249

Swansea University Authors: Miles Morgan, Bjornar Sandnes Orcid Logo

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DOI (Published version): 10.1051/epjconf/202124903041

Abstract

Fluid-driven grain flow through a confined channel filled with non-buoyant grains is herein observed to exist in three regimes according to total imposed flow rate. (1) At low imposed flow rates, no grain flow occurs as the fluid stress is insufficient to mobilise the grains and Darcy flow is observ...

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Published in: EPJ Web of Conferences
ISSN: 2100-014X
Published: EDP Sciences 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60829
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Abstract: Fluid-driven grain flow through a confined channel filled with non-buoyant grains is herein observed to exist in three regimes according to total imposed flow rate. (1) At low imposed flow rates, no grain flow occurs as the fluid stress is insufficient to mobilise the grains and Darcy flow is observed. (2) At a sufficient imposed flow rate, grains begin to flow at the top of the channel with self-similar Gaussian velocity profiles that become faster and encroach deeper into the channel with increased flow rate. (3) At high flow rates, significant grain flow occurs at the base of the channel, distorting the Gaussian profile, resulting in a gradual transition towards a more symmetric, full-channel flow. Each regime, and the transitions between them, is discussed in relation to experimental grain velocity measurements.
College: Faculty of Science and Engineering
Funders: This work was supported by the Engineering and Physical Sciences Research Council EPSRC grant EP/S034587/1.

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