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Limit Modes of Particulate Materials Classifiers
Adamčík, Martin ; Štěpánek, František (oponent) ; Fekete, Roman (oponent) ; Svěrák, Tomáš (vedoucí práce)
With material science demands on ever smaller particle sizes, new approaches and effective methods of their classification are needed. Turbulent flow field patterns and particle trajectories inside of a dynamic air classifier are investigated. Increasing computing power together with new turbulence models and approaches to simulate complex fully turbulent problems by solving Navier-Stokes equations allows studying and capturing smaller flow structures and properties more accurately. Particles below 10 microns are more susceptible to smaller local vortexes and particle fates are therefore more dependent on these local structures. Area of focus are the conditions required for classification of particles with sizes below 10 microns as this size is at the limit of air classification method possibilities. CFD software and the latest knowledge in turbulence modelling are used to numerically simulate flow field inside a dynamic air classifier. Effects of varying operating parameters on flow patterns and discrete phase classification outputs are investigated. Experimental verification of the simulated flow fields includes advanced imaging method (PIV) measurement of flow velocity and is used to visualize flow field structures in the classifier rotor blade passageway region. Predicted particle trajectories and their fates are experimentally verified by classification trials carried out on dynamic air classifier and the particle distribution curves are established by laser diffraction method. Tromp curves and efficiency of classification process are studied.
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Design of phosphate fertilizer mixer
Adamčík, Martin ; Svěrák, Tomáš (oponent) ; Pellant, Karel (vedoucí práce)
The thesis deals with phosphate fertilizer mixer design with respect to the assigned requirements. The thesis itself is divided into several sections, where the first one formulates objectives of the solution. Fundamental questions of the particular industry are answered with the accent to the variables, which affect quality of the mixing process. Next part presents idea solution with the set of calculations supporting both required throughput and mechanical design. Shaft is verified by both analytical and FEM method, resulting into similar output. Proposed mixer design is presented by the 3D models of its components, which were created by Autodesk Inventor software. The thesis includes also 2D documentation.
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Limit Modes of Particulate Materials Classifiers
Adamčík, Martin ; Štěpánek, František (oponent) ; Fekete, Roman (oponent) ; Svěrák, Tomáš (vedoucí práce)
With material science demands on ever smaller particle sizes, new approaches and effective methods of their classification are needed. Turbulent flow field patterns and particle trajectories inside of a dynamic air classifier are investigated. Increasing computing power together with new turbulence models and approaches to simulate complex fully turbulent problems by solving Navier-Stokes equations allows studying and capturing smaller flow structures and properties more accurately. Particles below 10 microns are more susceptible to smaller local vortexes and particle fates are therefore more dependent on these local structures. Area of focus are the conditions required for classification of particles with sizes below 10 microns as this size is at the limit of air classification method possibilities. CFD software and the latest knowledge in turbulence modelling are used to numerically simulate flow field inside a dynamic air classifier. Effects of varying operating parameters on flow patterns and discrete phase classification outputs are investigated. Experimental verification of the simulated flow fields includes advanced imaging method (PIV) measurement of flow velocity and is used to visualize flow field structures in the classifier rotor blade passageway region. Predicted particle trajectories and their fates are experimentally verified by classification trials carried out on dynamic air classifier and the particle distribution curves are established by laser diffraction method. Tromp curves and efficiency of classification process are studied.
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Design of phosphate fertilizer mixer
Adamčík, Martin ; Svěrák, Tomáš (oponent) ; Pellant, Karel (vedoucí práce)
The thesis deals with phosphate fertilizer mixer design with respect to the assigned requirements. The thesis itself is divided into several sections, where the first one formulates objectives of the solution. Fundamental questions of the particular industry are answered with the accent to the variables, which affect quality of the mixing process. Next part presents idea solution with the set of calculations supporting both required throughput and mechanical design. Shaft is verified by both analytical and FEM method, resulting into similar output. Proposed mixer design is presented by the 3D models of its components, which were created by Autodesk Inventor software. The thesis includes also 2D documentation.
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Mechatronics of classifying of microparticles by air separation
Adamčík, Martin ; Svěrák, Tomáš (oponent) ; Pellant, Karel (vedoucí práce)
The aim of presentated bachelor’s thesis is exploration of the possibilities of classifying the microparticles according to the size of particles of the material and modelling the specific classifier and its parts in 3D system. This thesis describes in detail air separation method, its utilization and benefits. For this purpose, in thesis are solved those particular problems. a)Description of the classification process. Definition of the particle size distribution, discussion the influence of the classifier parameters to the particle size distribution. b)Analysis of particular devices used for classification of particles in the process. c)Engineering design of the classification system of the air classifier. d)Modelling out designed device in the 3D system.
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