Discharge of rapeseeds from a model silo: Physical testing and discrete element method simulations
PBN-AR
Instytucja
Instytut Agrofizyki im. Bohdana Dobrzańskiego Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
COMPUTERS AND ELECTRONICS IN AGRICULTURE
ISSN
0168-1699
EISSN
Wydawca
ELSEVIER SCI LTD
DOI
Rok publikacji
2013
Numer zeszytu
Strony od-do
40-46
Numer tomu
97
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Słowa kluczowe
en
Discrete element method; Contact force models; Rapeseeds; Silo; Particles flow
Open access
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Język
en
Treść
Laboratory tests and discrete element method simulations were conducted to evaluate regions of validity of two basic contact models to describe flow rate of rapeseeds through horizontal orifice. Rectangular container of 50 by 50 mm cross section, 50 mm high, having hopper of 30° in inclination was used to hold seeds. Bedding of 10,000 seeds was generated in preparatory container and then discharged through square orifice of 12, 14 or 16 mm side to similar lower container. This was equipped with independent floor supported on load cell to measure the weight of seeds during discharge of the upper container. Rapeseeds of moisture content of 5.5% and 15% were used for testing. DEM simulations were performed in geometrical setup similar to laboratory equipment using spherical particles with material parameters of rapeseeds. Two contact models were used in simulations that were previously found to adequately represent impact of dry and wet seeds against flat surface. In laboratory testing mass flow rates of dry rapeseeds (5.5% M.C.) through the orifices were higher than that of wet (15% M.C.) seeds. In the simulations no difference in mass flow rates of dry and wet seeds was found if the mass flow rates were calculated as a sum of masses of particles falling into the receiving container per time unit. However, difference in the mass flow rates was observed if they were calculated using sum of vertical forces exerted by particles on walls and floor of receiving container. Simulations revealed that proposed contact models reproduced well experimental results for slow particle flow but for higher flow rates the models need to be improved by inclusion of dissipative term.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
594846
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