24 citations · 58 across the 9 of their papers we have counts for
9 papers
Forced silo discharge: Simulation and theory
Luis. A. Pugnaloni, Marcos A. Madrid, J. R. Darias
We study, through discrete element simulations, the discharge of granular materials through a circular orifice on the base of a cylindrical silo forced by a surcharge. At the begin…
Differential equation for the flow rate of discharging silos based on energy balance
J. R. Darias, Marcos A. Madrid, Luis A. Pugnaloni
Since the early work of Hagen in 1852 and Beverloo et al. in 1961, the flow rate of granular material discharging through a circular orifice from a silo has been described by means…
Forced flow of granular media: Breakdown of the Beverloo scaling
Marcos A. Madrid, J. R. Darias, Luis A. Pugnaloni
The Beverloo scaling for the gravity flow of granular materials through orifices has two distinct universal features. On the one hand, the flow rate is independent of the height of…
A differential equation for the flow rate during silo discharge: Beyond the Beverloo rule
Marcos A. Madrid, José R. Darias, Luis A. Pugnaloni
We present a differential equation for the flow rate of granular materials during the discharge of a silo. This is based in the energy balance of the variable mass system in contra…
Self-adjoint Dirac type Hamiltonians in one space dimension with a mass jump
L. A. González-Díaz, Alberto A. Díaz, S. Díaz-Solórzano +1
Physical self-adjoint extensions and their spectra of the one-dimensional Dirac type Hamiltonian operator in which both the mass and velocity are constant except for a finite jump…
Silo collapse under granular discharge
G. Gutiérrez, C. Colonnello, P. Boltenhagen +4
We investigate, at a laboratory scale, the collapse of cylindrical shells of radius and thickness induced by a granular discharge. We measure the critical filling height fo…
Simulation of grains in a vibrated U-tube without interstitial fluid
J. R. Darias, I. Sánchez, G. Gutiérrez +1
We present a computational study using Molecular Dynamics of the development of an accumulation of grains in one side of a two dimensional U-tube under vertical vibrations. Studyin…
Motion of grains in a vibrated U-tube
J. R. Darias, I. Sanchez, G. Gutierrez
We investigate experimentally the behavior of the rate of growth of a column of grains, in a partially filled vertically shaken U-tube. For the set of frequencies used we identify…
Granular instability in a vibrated U tube
I. Sánchez, J. R. Darias, R. Paredes +2
We study experimentally the collective motion of grains inside a U shaped tube undergoing vertical oscillations, and we develop a very simple quantitative model that captures relev…