Abstract
Experiments on the discharge of a silo with an inclined outlet are performed using flattened seeds in order to evaluate the validity of a previous theoretical formulation developed in our work group [1]. In that description, funnel flow regime is assumed to be based on a free fall parabolic arc. The shape of this arc is described with a parameter which is the only one involved in the flow rate formulation. An experimental analysis of the behavior of this parameter is carried out based on the geometry and shape of the grains within the silo. Also, video analysis of the silo discharge is performed in order to investigate the velocity profiles at the outlet of the hopper for these non-spherical particles. Experiments are contrasted with analytical predictions derived from the proposed formulation in order to assess and discuss its validity for the case of flattened particles.
Highlights
Experiments on the discharge of a silo with an inclined outlet are performed using flattened seeds in order to evaluate the validity of a previous theoretical formulation developed in our work group [1]
Many industrial challenges involve an adequate design of silos determining the pressures exerted on the walls, the precise geometry for flow control and the characterization of the grains that will be stored [2,3,4].it is highly relevant to characterize the granular flow within silos and hoppers, with especial attention on the behavior that typical food industry seeds have inside of them
It is worth to mention that eq 1 does not depend on the hopper angle β since it is only valid for funnel flow regime, i.e., for angles larger than the internal dynamic angle
Summary
Experiments on the discharge of a silo with an inclined outlet are performed using flattened seeds in order to evaluate the validity of a previous theoretical formulation developed in our work group [1]. Funnel flow regime is assumed to be based on a free fall parabolic arc. The shape of this arc is described with a parameter which is the only one involved in the flow rate formulation. It is well known that the flow patterns found inside a silo can be classified in two main regimes separated by one there are only few works dedicated to study the influence of the particle shape on the discharge rate [13, 16]. Both models were contrasted with experiments, resulting in a very good agreement
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