Simulação orientada a objeto do transporte pneumatico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

Particle transportation by a gas stream, commonly named as pneumatic conveying, has been ftequently used in a large variety of industrial processes. This is due not only to the diversity of materiais produced and handled in a granulated form, as also to the great number of possible applications of that operation, which includes since the simple displacement of solids to relatively more complicated tasks such as drying and catalytic cracking. Due to the its spread industrial use, the pneumatic conveying technology has been intensively studied and improved along the years, in the attempt of propitiating its application in a more rational and optimized manner. This works reports the investigation of dynamic phenomena of the vertical pneumatic conveying through the development and implementation of an object oriented model, three-dimensional, discrete, deterministic and transient to the particulate phase. The fluid phase is modeled in a pseudo-bidimensional way, separated ftom the solid phase. The dynamic effects between the two phases are considered by bi-directional terms such as the drag force on the particles and the momentum generation in the fluid. The proposed model regards the effects of bi-directional coupling and three-dimensional movement of the particles. The presented Object Oriented Simulation (OOS) methodology enabled the capture of complex dynamic patterns, such as the partic1es refluxing and the precipitation of solids near the pipe waIl. Besides, due to the object-oriented properties, the model allowed the simulation of polydispersed mixtures, qualifying it to study the segregation phenomena in pneumatic transport systems. The obtained results were analyzed through the fluid and particles velociiy profiles, pressure drop curves, diameters distribution curves and polychromatic visualization diagrams, allowing to verify the physical consistence of the model. In addition, comparisons were accomplished with global and local experimental data, which exhibited satisfactory agreement, ratifying the reliability ofthis methodology

ASSUNTO(S)

simulação (computadores) escoamento bifasico transporte por tubo pneumatico dinamica dos fluidos

ACESSO AO ARTIGO

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