Silo discharge of mixtures of soft and rigid grains
arXiv:2102.00958 · doi:10.1039/D0SM01887B
Abstract
We study the outflow dynamics and clogging phenomena of mixtures of soft, elastic low-friction spherical grains and hard frictional spheres of similar size in a quasi-two-dimensional (2D) silo with narrow orifice at the bottom. Previous work has demonstrated the crucial influence of elasticity and friction on silo discharge. We show that the addition of small amounts, even as low as 5\%, of hard grains to an ensemble of soft, low-friction grains already has significant consequences. The mixtures allow a direct comparison of the probabilities of the different types of particles to clog the orifice. We analyze these probabilities for the hard, frictional and the soft, slippery grains on the basis of their participation in the blocking arches, and compare outflow velocities and durations of non-permanent clogs for different compositions of the mixtures. Experimental results are compared with numerical simulations. The latter strongly suggest a significant influence of the inter-species particle friction.
References in corpus (17)
- Jamming during the discharge of granular matter from a silo
- Fraction of clogging configurations sampled by granular hopper flow
- Spanning the Scales of Granular Materials: Microscopic Force Imaging
- Role of vibrations in the jamming and unjamming of grains discharging from a silo
- Granular discharge and clogging for tilted hoppers
- Clogging in constricted suspension flows
- Geometry dependence of the clogging transition in tilted hoppers
- Clogging of soft particles in 2D hoppers
- Pressure independence of granular flow through an aperture
- Invited review: Clogging of granular materials in bottlenecks
- Transition from clogging to continuous flow in constricted particle suspensions
- MC-DEM: a novel simulation scheme for modeling dense granular media
- Silo outflow of soft frictionless spheres
- Granular discharge rate for submerged hoppers
- The sands of time run faster near the end
- Intermittent flow and transient congestions of soft spheres passing narrow orifices
- Differential equation for the flow rate of discharging silos based on energy balance