Statistical tool combined with image analysis to characterize hydrodynamics and mass transfer in a bubble column

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

A. Ferreira (Autor) FEUP; G. Pereira (Autor) Outra; J. A. Teixeira (Autor) Outra; F. Rocha (Autor) FEUP

Revista

Título: Chemical Engineering Journal

Vol. 180

Páginas: 216-228

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 41 Citações

ISI Web of Science

Scopus - 53 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

PEst-C/EQB/UI0511/2011 - PROJECTO ESTRATÉGICO - UI 511 - 2011-2012

Outras Informações

ID Authenticus: P-002-DWM

DOI: 10.1016/j.cej.2011.09.117

Abstract (EN): Image analysis technique has been proved to be very effective in the quantification of particles size and morphology distributions in different work areas. In the present work this technique was combined with the discriminant factorial analysis (DFA) in order to allow the automatic identification of single bubbles (isolated bubbles without influence of surrounded bubbles) in multiphase systems. With the previous methodology it has been possible to distinguish online and automatically among three different classes of bubbles (single bubbles and medium complexity and large complexity bubbles groups), allowing for the first time the computation of the local bubble population complexity in the system. The automatic and correct characterization of the single bubbles allowed the correct determination of bubble size and, consequently, the specific interfacial area a at different experimental conditions. Agreement between automated and manual classification, measured in terms of a performance index, is 98% for single bubbles identification. Further, the present work describes the application of such methodology to the study of temperature, type of gas sparger, and liquid phase properties (viscosity and surface tension) influence on the individual components of volumetric liquid side mass transfer coefficient, k(L)a. The results show that the different experimental parameters and liquid properties act by a particular way on k(L) and a.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13