Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/11297
Título: | Liquid backmixing in oscillatory flow through a periodically constricted meso-tube |
Autor(es): | Reis, N. Vicente, A. A. Teixeira, J. A. |
Palavras-chave: | Backmixing Smooth-periodic constrictions Oscillatory flow Meso-tube Liquid flow Continuous |
Data: | 2010 |
Editora: | Elsevier |
Revista: | Chemical Engineering and Processing : Process Intensification |
Citação: | "Chemical Engineering and Processing : Process Intensification". ISSN 0255-2701.49:7 (2010) 793-803. |
Resumo(s): | This paper deals with the measurement and modelling of axial liquid dispersion in a 4.5 mm internal diameter tube provided with smooth-periodic constrictions (meso-tube) in steady and oscillatory flow conditions. The residence time distribution (RTD) in the meso-tube was monitored for a range of fluid oscillation frequency (f) and amplitude (x0) at laminar flow. The RTD response was modelled with three hydrodynamic models: (i) tanks-in-series, (ii) tanks-in-series with backflow and (iii) plug flow with axial dispersion. The steady flow through the meso-tube at flow rates up to 21.30 ml/min resulted in broad RTDs, mainly due to the parabolic velocity profile. The use of fluid oscillations allowed a fine-control of the axial liquid dispersion in the meso-tube due to generation of secondary flow in the regions between the constrictions. The axial dispersion coefficient D was reduced by up to 13-fold in comparison with the steady flow situation. Values of x0 ≤ 1 mm and f = 10 Hz generally resulted in a maximum reduction in axial dispersion through, therefore maximum improvements in RTD. The tanks-in-series model was generally not capable of predicting RTDs in the meso-tube. The potential of this platform for the continuous, sustainable production of added-value products is herein demonstrated. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/11297 |
DOI: | 10.1016/j.cep.2010.01.014 |
ISSN: | 0255-2701 |
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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Reis_Chemical Engineering and Processing Process Intensification.pdf | 802,49 kB | Adobe PDF | Ver/Abrir |