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Orientador(es)
Resumo(s)
The permeability of binary packings of glass beads with different size ratio –
13.3, 20, and 26.7, was investigated. In the Kozeny–Carman equation, the dependence of
the tortuosity s on the mixture porosity e(xD) was described according to s = 1/en for different
volume fraction of large particles in the mixture, xD. Obtained data on packing permeability
shows that the parameter n is a function of the volume fraction and particle size
ratio, with values between 0.5 and 0.4. This can be explained by the wall effect resulting
from the arrangement of the small particles occurring near the large particle surface. A
model taking in account this effect was suggested that can be useful in the characterization
of transport phenomena in granular beds as well as in engineering applications.
Descrição
Palavras-chave
Binary mixture Porosity Particle size ratio Tortuosity Permeability
Contexto Educativo
Citação
Dias, Ricardo P.; Fernandes, Carla S.; Teixeira, José A.; Mota, Manuel; Yelshin, Alexander (2008). Permeability analysis in bisized porous media: wall effect between particles of different size. Journal of Hydrology. ISSN 0022-1694. 349:3-4. 470-474