The relative importance of design variables affecting the fluiddynamic behavior of a fluidized bed reactor for the gas-phase ethylene polymerization is discussed, based on mathematical modeling. The three-phase bubbling fluidized bed model is based on axially distributed properties for the bubble, cloud and emulsion phases, combined with correlations for population balance and entrainment. Under the operating conditions adopted in most industrial processes, the reactor performance is affected mainly by the reaction rate and solids entrainment. Simulation results indicate that an adequate design of the freeboard and particle collecting equipment is of primary importance in order to produce polymeric particles with the desired size distribution, as well as to keep entrainment and catalyst feed rates at adequate levels
O ensino universitário pode ser pensado do ponto de vista de temporalidade, em que o referencial passado se remete à bagagem de conhecimento intelectual que o aluno carrega ao entrar na universidade; o presente, ao momento em que o aluno cursa o ensino superior; e o futuro, ao profissional generalista que precisa ser formado. Buscando inter-relacionar passado, presente e futuro, o programa Triatlo Acadêmico envolve ensino, pesquisa e extensão para alunos ingressantes na Escola de Engenharia da Universidade Presbiteriana Mackenzie, sendo desenvolvido em três projetos com foco na formação básica dos alunos (Desafio Universitário), na formação do ensino superior relacionada aos componentes curriculares de física e cálculo (Você Sabe!?.) e na pesquisa para a solução de problemas relacionados às necessidades das pessoas nas
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