Abstract
A new experiment shows that clogging in silo discharge depends on the silo width and correlates with some features of the velocity of the grains and the kinetic stress near the orifice. The probability of clogging is maximum when the kinetic stress values in the arching region are more homogeneous.
Highlights
When a many-body system passes through a bottleneck, the development of blockages may lead to flow intermittencies that eventually end up in a complete arrest of the flow
The first experimental results presented are about the statistics of the avalanche sizes
For values of W3D/d3D above 5.75 the avalanche size grows with the silo width
Summary
When a many-body system passes through a bottleneck, the development of blockages may lead to flow intermittencies that eventually end up in a complete arrest of the flow This clogging phenomenon appears in many different systems with typical sizes ranging over several orders of magnitude. On an intermediate scale, clogging of granular materials in narrow conduits and silos supposes an hindrance as its occurrence may completely arrest a production line Clogging in all these different systems shares strong similarities [6] and, in the past years, its noteworthy importance has lead to a significant advance in its understanding. This has been especially notable for the case of inert grains within a silo, a system which has been traditionally used as a reference to compare other, more complex, scenarios. Clogging is characterized by avalanche size statistics, where avalanche sizes are defined as the number of beads that flow out
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