Kinematics of the jamming front resulting from the clogging of the flow of monodisperse inelastic particles in a partially obstructed chute
- 1Instituto Superior Tecnico, Universidade de Lisboa, CERIS, Civil engineering, achitecture and georesources, Lisboa, Portugal
- 2Institute of Hydro-Engineering of Polish Academy of Sciences, Department of Coastal Engineering and Dynamics, Gdańsk, Polska
- 3National Laboratory of Civil Engineering, Lisboa, Portugal
- 42Faculty of Science and Technology, Free University of Bozen-Bolzano, Italy
We characterize experimentally the upstream-progressing jamming wave triggered by the clogging of a granular flow down a partially obstructed chute. We generated dry granular flows in a sloping chute whose outlet was obstructed by a wall with two vertical gaps, twice the diameter of the granular material. We conducted 31 repetitions of the same test to obtain stable statistics. We employed Particle Tracking Velocimetry (PTV) to determine particle velocities at the sidewall and estimated fields of mean velocity and granular temperature by ensemble-averaging. Each ensemble is a set of valid grain velocities collected in space-time bins, that map the entire domain, over all test repetitions. The system is highly dissipative due to collisions and enduring contacts among inelastic particles, resulting in generalised cooling. Clogging occurs as a consequence of the formation of stable arch-like structures at the outlet, while the flow cools down. We observe that the jamming wave propagates against the flow at different values of granular temperature and mean velocity. There is no triple point in the system in the sense that jamming is always preceded by gas-liquid transition. For the tested conditions, jamming can be described as an accretion problem, leading to a granular solid state from liquid state and never from the gaseous state. The jamming wavefront progresses faster as the values of the granular temperature decrease. Flow cooling, including gas-fluid transitions, seem independent of jamming, which is compatible with the range of observed granular Froude and Mach numbers. The jamming wavefront becomes faster than the adiabatic speed of sound of the granular material moving towards the jammed region.
Acknowledgements: This work was partially funded by the Portuguese Foundation for Science and Technology (FCT) through Project DikesFPro PTDC/ECI-EGC/7739/2020 and through CERIS funding UIDB/04625/2020
How to cite: L Ferreira, R. M., Mendes, S., Aleixo, R., Amaral, A., and Larcher, M.: Kinematics of the jamming front resulting from the clogging of the flow of monodisperse inelastic particles in a partially obstructed chute, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-20911, https://doi.org/10.5194/egusphere-egu24-20911, 2024.
