Análise do efeito das propriedades físicas de particulados na fluidodinâmica do leito de jorro cônico

• Ano de defesa: 2025
• Autor(a) principal: Castanheira, Vinícius Castilholi
• Orientador(a): Sousa, Robson Costa de
• Banca de defesa: Guidolini, Icaro Pianca , Freire, Fabio Bentes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; Mestrado em Engenharia Química
• Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Química
• Departamento: Centro de Ciências Agrárias e Engenharias
• País: BR
• Palavras-chave em Português: Engenharia Química; Mecânica de Fluidos; Partículas; Leito de jorro cônico; Fluidodinâmica; Propriedades; Conical spouted bed; Fluid dynamics; Properties
• Área do conhecimento CNPq: Engenharia Química
• Link de acesso: http://repositorio.ufes.br/handle/10/19810

The conical spouted bed has important applications in industrial processes such as drying and pyrolysis of biomass, in which they have varied physical characteristics, generating different fluid behaviors In this context, the present study aimed to To analyze the effect of the physical properties of particulate matter on the fluid-dynamic behavior of the conical spouting bed from the analysis of experimental data and the comparison with predictions of parameters obtained by empirical equations and correlations present in the literature. The characterization of the glass spheres, coffee and black pepper beans, annatto seeds, jackfruit, açaí and residue such as orange pomace involved the measurement of apparent densities, actual density, bulk density, bed porosity, diameter, sphericity and roundness. The conical spouting bed used has a total height of 70.0 cm, an internal diameter of 19.0 cm, a cylindrical column with a height of 47.0 cm, and a cone at the bottom of the column with a height of 15 cm with a tilt angle of 60º. The main effects of the physical properties showed that the highest pressure drops (maximum and stable) were influenced by physical characteristics such as density, mainly for glass spheres (2500 kg/m³) and açaí seeds (1366 kg/m³) and jackfruit (1209 kg/m³) in the case of biologic materials. The size of these materials also influenced the fluid dynamics of the bed, especially the minimum spouting velocity. The correlations adjusted with statistical treatment presented more satisfactory results in relation to the correlations found in the literature for the prediction of parameters such as Reynolds minimum spout, maximum pressure drop and stable spout. Finally, the study of fluid-particle interactions with the analyzed materials was carried out in the present work in conical spouted bed. It was possible to notice that materials of lower sphericity presented higher drag coefficients, being greater than drag force exerted by the fluid. By contrast, spherical particles exhibited lower flow resistance, resulting in a reduced drag coefficient. In general, it was possible to observe the real influence of physical properties on fluid dynamic parameters, and the results were consistent with what was observed in the literature