Book Chapter10.1007/978-3-540-77074-9_52
Flow and Jamming of Granular Matter Through an Orifice
Angel Garcimartín,Cristian Mankoc,Alvaro Janda,Roberto Arévalo,J. Martín Pastor,Iker Zuriguel,Diego Maza +6 more
- 01 Jan 2009
- pp 471-486
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TL;DR: In this paper, the jamming probability is measured and it is shown that above a certain orifice size no jamming can occur, and a power law divergence is found when that value is approached, and the flow rate is different for small and large orifices.
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Abstract: When particles pass through an orifice, jamming can occur. The question is whether a jammed structure can be considered a new state of matter, and if the flow behaves differently when approaching jamming. An experiment, consisting of a silo filled with grains and an orifice at the base, is presented here. The jamming probability is measured, and it is shown that above a certain orifice size no jamming can occur. A power law divergence is found when that value is approached. Besides, the flow rate is different for small and large orifices. For large orifices, the Beverloo equation states that the flow depends on the diameter to the 5/2 power. But this relation breaks down for small orifices. A new functional dependence is proposed, in agreement with the experiments and the numerical simulations. Furthermore, the statistical analysis of the fluctuations for small orifices shows anomalous behavior.
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Citations
Discharge rates of dry granular material from bins with lateral exit holes
TL;DR: In this paper, the mass flow rate of the lateral outflow of cohesionless sand beach and granulated sugar through circular orifices of diameter D and rectangular and triangular slots of hydraulic diameter DH made in vertical walls of bins was analyzed experimentally.
25
Modeling the relationship between the shape and flowing characteristics of processed sands
TL;DR: In this article, a simple empirical relation was found between the shape factor of particles by Beverloo's law and the actual shape of particles, characterized by a shape index defined in this study.
14
•Dissertation
Experimental study of hydro-mechanical behaviour of granular materials
Gilbert Joseph Kasangaki
- 01 Nov 2012
TL;DR: In this paper, the authors present a Declaration Statement and acknowledgement of the authorship and acknowledgements of the author, including the author's family and the authors' families.
9
References
Jamming is not just cool any more
Andrea J. Liu,Sidney R. Nagel +1 more
TL;DR: In this article, it was suggested that the properties of jammed solids should be considered as belonging to a new class of materials known as fragile matter which, because of its unusual mechanical properties, requires a new theoretical description.
2K
•Book
Statics and Kinematics of Granular Materials
R. M. Nedderman
- 01 Nov 1992
TL;DR: In this article, Coulomb's method of wedges and differential slices were used to determine the stress and strain rate of Coulomb material, and the conical yield function was used to predict mass flow rate.
1.2K
The flow of granular solids through orifices
TL;DR: In this article, the authors compared the results of their own investigations on the flow of granular solids (a number of seeds) with results published by others, and showed that the results were similar to those of others.
843
Force Schemes in Simulations of Granular Materials
TL;DR: In this article, the authors systematically study the properties of the force laws most commonly used and compare them with recent experiments on the impact of spheres, and point out possible problems and give criteria for the right choice of parameters.
751