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Volpato, S. (2017) Modeling of segregation in dense granular flows. [Ph.D. thesis]

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Abstract (english)

In this thesis, a continuum framework, composed of equations of mass, momentum and fluctuating kinetic energy, coupled to one capable of describing the evolution of the interface between air and granular material, was used to study the
dense motion of granular materials within two industrially relevant equipments: mixers and silos. The model uses the constitutive equations to close the system of equations and a phenomenological approach to describe the behavior of granular materials. A second model, capable of describing the evolution of the segregation of a bidispersed mixtures through a transport equation, was used to model the segregation. The segregation model is flexible; in fact it is possible to describe the segregation speed using different relationships depending on the segregation mechanisms.
As a first approach, it was decided to adopt a relation deriving from Literature approaches. Despite the use of this relation has led to good results, a further study based on experiments and DEM simulations has been done to improve the
description of the segregation velocity to be used in segregative model.

Abstract (italian)

In questa tesi è stato utilizzato un modello continuo, che utilizza equazioni di massa, momento ed energia cinetica accoppiato ad uno capace di descrivere l’evoluzione dell’interfaccia tra aria e granulare per studiare il moto denso di materiali granulari all' interno di due apparecchiature di interesse industriale: miscelatori rotanti e sili di stoccaggio. Il modello per chiudere il sistema di equazioni utilizza delle equazioni costitutive e un approccio fenomenologico che descrive il comportamento del granulare. Un secondo modello, capace di descrivere l’evoluzione della segregazione di miscele bi-componente attraverso una equazione di trasporto, è stato accoppiato al primo per modellare la segregazione nei sili. Il modello segregativo è flessibile; infatti è possibile descrivere la velocità di segregazione utilizzando diverse relazioni a seconda dei meccanismi segregativi considerati. Come primo approccio, si è deciso di adottare una relazione ottenuta combinando due approcci trovati in Letteratura. Nonostante l’utilizzo di questa relazione abbia portato a buoni risultati, è stato fatto uno studio più approfondito basato su esperimenti e su simulazioni DEM per migliorare la descrizione della velocità di segregazione da usare nel modello segregativo.

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EPrint type:Ph.D. thesis
Tutor:Santomaso , A.C.
Ph.D. course:Ciclo 29 > Corsi 29 > INGEGNERIA INDUSTRIALE
Data di deposito della tesi:30 January 2017
Anno di Pubblicazione:30 January 2017
Key Words:granular materials, segregation, silos, finite element method, discrete element method
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/25 Impianti chimici
Struttura di riferimento:Dipartimenti > Dipartimento di Ingegneria Industriale
Codice ID:10125
Depositato il:02 Nov 2017 16:46
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