This work reports a theoretical and experimental study to evaluate the fluid dynamic of an Upflow Anaerobic Sludge Blanket reactor (UASB), treating domestic wastewater in a pilot scale. Simulations were developed using the Ansys CFX 10.0. For validating the numerical results, an experimental study was conducted by monitoring the total concentration of suspended solids in the effluent and pressure along the reactor. The comparative analysis between the numerical and experimental results of the pressure and sludge concentration in the outlet of the reactor presented few differences, being considered satisfactory.

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This work performed a three-dimensional numerical study to describe the hydrodynamics of upflow anaerobic sludge blanket reactor treating domestic wastewater. The simulations were made in the commercial software Ansys CFX®. Different inclinations of the gas deflector were considered, to assess its influence on the velocity field inside the reactor. In order to validate the numerical study, we used experimental data regarding the inflow, the inlet and outlet concentrations of the organic matter, the concentration of solids at the liquid-gas interface and at the reactor outlet, and the pressure field inside it. The comparison between the numerical and experimental results demonstrated small differences. The mathematical model used to describe the hydrodynamics flow in the UASB reactor was quite satisfactory since it adequately has reproduced the physical behavior inside the reactor.

Este artigo tem como objetivo estudar o escoamento trifásico água – óleo pesado – ar em dutos horizontais, utilizando a técnica “core annular flow”. O modelo matemático utilizado foi o não-homogêneo, numa abordagem Euleriana – Euleriana. Considerou-se o modelo de mistura para tratar os termos de transferência de momento interfacial entre as fases contínuas (água e óleo pesado) e o modelo de partícula para tratar os termos de transferência de momento interfacial entre as fases dispersa e contínua (ar e óleo pesado). Todas as simulações foram realizadas utilizando o Software CFX versão 11. Resultados dos campos de pressão e fração volumétrica das fases e queda de pressão no duto são apresentados e comparados com dados experimentais. Verificou-se que a modelagem matemática utilizada foi adequada, apresentado erro máximo com relação aos dados experimentais de queda de pressão de 7,3%, demonstrando a eficiência da técnica core-flow para o transporte trifásico de água - óleo pesado – ar.

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