Simulação numérica da evaporação de gotas em meios porosos : uma abordagem baseada em modelos de escalas de poros
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Data
2014-08-29
Autores
Sartim, Rafael
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Universidade Federal do Espírito Santo
Resumo
The study of the impact and evaporation of liquid droplets on porous surfaces, especially for hazardous chemical compounds, is an important research topic for environmental sciences. This class of problems may poses some imitations for the use of conventional modeling techniques used for drying on porous media, since size of the droplets impinged on the porous media is of the order of a few millimeters (10-3 – 10-4 m) and the pore size is usually of the order of a few micrometers (10-4 – 10-5 m). This has motivated the development and use of “pore-scale models”, which attempt to simulate the transport and evaporation at the pore scale. This work presents a computational model for the drying of liquid droplets embedded on porous media based on a pore-scale model. The model formulation is based on the work originally proposed by Prat (1993). In order to increase the generality of the model, gravitational and viscous effects were also considered, as well as, the formation of liquid film, as proposed by Yiotis et al. (2007). The numerical results indicate that the viscous and gravitational effects are not really relevant for this class of problems. In general, the results obtained by the model without the presence of liquid films is in better agreement with experimental data than the results obtained by the model with the presence of liquid films.
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Porous media , Droplets evaporation , Pore network models , Meios porosos , Evaporação de gotas , Modelo de escala de poros , Evaporação