Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/3371
Título: | Effect of solids on homogeneous–heterogeneous flowregime transition in bubble columns |
Autor(es): | Mena, P. C. Ruzicka, M. C. Rocha, F. A. Teixeira, J. A. Drahoš, J. |
Palavras-chave: | Bubble column Solids Flow regimes Regime transition Stability |
Data: | Nov-2005 |
Editora: | Elsevier 1 |
Revista: | Chemical Engineering Science |
Citação: | "Chemical Engineering Science". ISSN 0009-2509. 60:22 (Nov. 2005) 6013-6026. |
Resumo(s): | Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous–heterogeneous flow regime transition in a bubble column 0.14m diameter. Air, distilled water and calcium alginate beads (2.1 mm, 1023 kg/m3) at concentrations c=0–30% (vol.) were the phases. The basic data were the voidage–gas flow rate dependences. The critical point, where the homogeneous regime loses stability and the transition begins, was evaluated by the drift flux model. The critical values of voidage and gas flow rate were the quantitative measures of the homogeneous regime stability. These were plotted against the solid phase concentration. It was found, that both the voidage and the critical values increased with the solid content at low solid loading, approx. c=0–3%, and decreased at higher loading, c>3%. The homogeneous regime was thus first stabilized and then destabilized. To explain this dual effect, possible physicalmechanisms of the solid phase influence on the uniform bubble bed were discussed. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/3371 |
DOI: | 10.1016/j.ces.2005.04.020 |
ISSN: | 0009-2509 |
Versão da editora: | http://www.sciencedirect.com/science/journal/00092509 |
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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CES2005b-Mena[3].pdf | 460,27 kB | Adobe PDF | Ver/Abrir |