Axial dispersion of particles in a slugging column - the role of the laminar wake of the bubbles

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

O. N. Cardoso (Autor) Outra; T. S. Mayor (Autor) Outra; A. M. F. R. Pinto (Autor) FEUP; J. B. L. M. Campos (Autor) FEUP

Revista

Título: Chemical Engineering Science

Vol. 58 Nº 18

Páginas: 4159-4172

ISSN: 0009-2509

Editora: Elsevier

Indexação

ISI Web of Knowledge - 4 Citações

ISI Web of Science

Scopus - 3 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas

Outras Informações

ID Authenticus: P-000-F88

DOI: 10.1016/s0009-2509(03)00305-1

Abstract (EN): Axial solid dispersion promoted by Taylor bubbles in a batch liquid column was studied. A mechanistic model was developed to predict the axial solid dispersion. The model is based on the upward transport of particles inside closed wakes of non-interacting Taylor bubbles. The model predictions are compared with experimental data. The experimental data were obtained in a test tube of 32 mm internal diameter. The particle volumetric distribution was measured by several differential pressure transducers placed along the column. Two classes of glass beads, mean diameter 180 and 280 mum, were suspended in aqueous glycerol solutions, with glycerol percentage ranging from 40% (v/v) to 100% (v/v). The amount of particles in the column was such that the volumetric particle fractions were 0.1, 0.2 and 0.3, supposing homogeneous liquid-solid suspension. The air flow rate ranged from 90 x 10(-6) to 250 x 10(-6) m(3)/s at PTN conditions. The obtained experimental data are in good agreement with the model predictions for laminar wakes, i.e., closed wakes with internal recirculation and without vortex shedding. The experimental data show a higher upward particle transport for wakes in the transition laminar-turbulent regime; closed wakes with internal recirculation and vortex shedding. The upward particle transport is higher for increasing air flow rate, decreasing particle diameter and increasing amount of particles in the column.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14