The first part of the thesis focuses on the analysis of experimental data collected for pipe flow of broadly graded slurry in the laboratory at the Institute of Hydrodynamics (IH) of the Czech Academy of Sciences in Prague. The studied slurry was a mixture of water and fractions of sand and the analysed database contained measurements of the hydraulic gradient, the mean velocity and the solids distribution along the cross-section of the pipe. The second part of the thesis discusses a new method proposed to predict the hydraulic gradient and spatial volumetric concentration. The method makes use of a new version of the Two-layer model and the Four-component model. The former is meant to deal with narrow-graded slurries transported in inclined pipes, while the latter takes into account the different diameters that characterize the solid phase.
La prima parte della tesi è incentrata sull’analisi di dati sperimentali che sono stati condotti presso il laboratorio dell’Istituto di Idrodinamica dell’Accademia delle Scienze Ceca a Praga. Questi hanno come oggetto di interesse il flusso in condotta di uno slurry formato da solidi di varie dimensioni. In particolare, è costituito da un mix di acqua e sabbia e il database analizzato contiene misurazioni sul gradiente idraulico, la velocità media e la distribuzione dei solidi lungo la sezione della condotta. La seconda parte della tesi introduce un nuovo metodo atto a predire il gradiente idraulico e la concentrazione volumetrica in situ. Questo fa uso di una nuova versione del modello del doppio strato e del modello a quattro componenti. Il primo considera slurries aventi solidi di dimensione omogenea trasportati in condotte non orizzontali, mentre il secondo tiene conto delle varie classi diametrali che compongono la fase solida.
New method for prediction of broadly graded slurry flow in inclined pipe
Zhao, Mingdao
2021/2022
Abstract
The first part of the thesis focuses on the analysis of experimental data collected for pipe flow of broadly graded slurry in the laboratory at the Institute of Hydrodynamics (IH) of the Czech Academy of Sciences in Prague. The studied slurry was a mixture of water and fractions of sand and the analysed database contained measurements of the hydraulic gradient, the mean velocity and the solids distribution along the cross-section of the pipe. The second part of the thesis discusses a new method proposed to predict the hydraulic gradient and spatial volumetric concentration. The method makes use of a new version of the Two-layer model and the Four-component model. The former is meant to deal with narrow-graded slurries transported in inclined pipes, while the latter takes into account the different diameters that characterize the solid phase.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/186822