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https://hdl.handle.net/1822/5684
Título: | Tortuosity variation in a low density binary particulate bed |
Autor(es): | Dias, Ricardo P. Teixeira, J. A. Mota, M. Yelshin, Alexander |
Palavras-chave: | Particle mixtures Binary spheres packing Size ratio Porosity Tortuosity |
Data: | Set-2006 |
Editora: | Elsevier 1 |
Revista: | Separation and Purification Technology |
Citação: | "Separation and Purification Technology". ISSN 1383-5866. 51:2 (Sept. 2006) 180-184. |
Resumo(s): | The 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 up to 53.8 was analysed in terms of porosity, tortuosity and permeability. The packing procedure was performed without intensive compacting methods e.g. vibration, etc. Obtained results show that the parameter n is a function of the volume fraction of large particles xD and, for spherical particles, lies in the range 0.4–0.5. The explanation for this variation is (1) a distortion effect on the small particles arrangement occurring near the large particle surface; (2) in the region of minimum porosity, near contact points of large particles, the occurrence of dead zones that are free of small particles. A relationship accounting for this effect is proposed that may be useful for the analysis of transport phenomena in granular bed filters, chromatographic columns, etc. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/5684 |
DOI: | 10.1016/j.seppur.2006.01.010 |
ISSN: | 1383-5866 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Sep.Pur.Technol[1].pdf | 380,17 kB | Adobe PDF | Ver/Abrir |