Project/scholarship details
- Project/scholarship ID
37500
- Reference
POCTI/EQU/37500/2001
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
POCI
- Funding amount
57,585.00 €
- Start date
2002-01-01
- End date
2005-09-01
Documents
Effect of real particles packing with large size ratio on porosity and tortuosi...
Mota, M.; Teixeira, J. A.; Dias, Ricardo P.; Yelshin, AlexanderThe complexity of processes involved in the formation of granular beds results in limited information about permeability κ , which directly rela tes with packing porosity ε and tortuosity T . For a mixed bed of particles significantly different in size, the influence of packing affects permeability. For a better understanding of the underlying relationship between κ , ε , and T in mixed beds of particles signif...
Dependence of Saccharomyces cerevisiae filtration through membrance on yeast co...
Mota, M.; Teixeira, J. A.; Yelshin, AlexanderFiltration of baker’s yeast in an isotonic solution through a 0.45 micron membrane was investigated for yeast concentrations in the range 0.14 – 51 g/L at filtration pressures between 40 and 80 kPa. Yeast filtration through membranes depends on applied filtration pressure and on slurry concentration. It was found that for a yeast volume fraction in suspension above 0.06 the porosity of the yeast cake becomes we...
Particulate binary mixtures : dependence of packing porosity on particle size r...
Dias, Ricardo P.; Teixeira, J. A.; Mota, M.; Yelshin, AlexanderBinary mixtures with significant size ratios are scarcely studied. Yet, contaminants of chromatographic columns or ion-exchange resins have size ratios of delta < 0.1. Binary mixtures of glass beads with delta = 0.1-0.0375 were used experimentally to measure packing porosity. Simultaneously, a significant number of published data was analyzed. A linear mixing model was adopted to predict the porosity of each pa...
Preparation of controlled particulate mixtures with glass beads of different sizes
Dias, Ricardo P.; Teixeira, J. A.; Mota, M.; Yelshin, AlexanderA method of mixing/preparing binary and ternary mixtures of glass beads was developed using a viscous solution of glycerol in water. After mixing, the mixture was transferred to a prismatic vessel and glycerol was washed out. The different sized beads were differently coloured and digital pictures taken from each face were automatically treated by image analysis to determine the coloured fraction present in eac...
Baker’s yeast filtration through mixed beds of filtration aids and large glass ...
Mota, M.; Teixeira, J. A.; Yelshin, AlexanderFiltration of baker´s yeast through a mixed particulate bed of filter aid and glass beads was investigated. Glass beads form the large size particle fraction in the mixture, whereas the small size particle fraction was made by the following filter aids: kieselgel, kieselguhr-G, and industrial kieselguhr of different grades. Investigated particle size ratio of beads and filter aids was in the range around 20 – 1...
Tortuosity variation in a low density binary particulate bed
Dias, Ricardo P.; Teixeira, J. A.; Mota, M.; Yelshin, AlexanderThe importance of particle size ratio and particle composition in the properties of a mixed bed is well known. Nevertheless, the dependence of the bed channel tortuosity T on the porosity ε in the form T=1/εn, where n is assumed to be a constant, shows that the value of n depends on the properties of the packed bed. For loose packing, experimental data for binary mixtures of glass beads of a size ratio from 1 u...
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