Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/31551

TitleO2 mass transfer in an oscillatory flow reactor provided with smooth periodic constrictions : individual characterization of kL and a
Author(s)Ferreira, António
Teixeira, J. A.
Rocha, F. A.
KeywordsOscillatory flow reactor
Multiphase reactors
Mass transfer
Liquid-side mass transfer coefficient
Specific interfacial area
Issue date2015
PublisherElsevier B.V.
JournalBiochemical Engineering Journal
CitationFerreira, António; Teixeira, José A.; Rocha, F., O2 mass transfer in an oscillatory flow reactor provided with smooth periodic constrictions. Individual characterization of kl and a. Chemical Engineering Journal, 262, 499-508, 2015
Abstract(s)In the present work the superficial gas velocities ( u G ) and the oscillatory conditions (frequency and amplitude) effects on the gas–liquid mass transfer process in a novel oscillatory flow reactor provided with smooth periodic constrictions (OFR-SPC) are experimentally evaluated. The liquid-side mass transfer coefficient, k L , and the specific interfacial area, a, are studied individually. The specific interfacial area is obtained using the new automatic image analysis technique developed by Ferreira et al. (2012). The experimental results of volumetric liquid side mass transfer coefficient ( k L a ), Sauter mean diameter ( d 32 ) and gas holdup ( ε G ), and the calculated values of a and k L , are correlated with the superficial gas velocity and the power density ( P / V ), in order to be used in scale-up processes and in comparisons with the literature. The results show that k L a increases with both superficial gas velocity and oscillatory conditions, the last ones having the highest impact on the mass transfer process. The increase in the oscillation motion (frequency and amplitude) results in bubble size reduction (from ∼7 mm, without oscillation, to ∼1 mm, with oscillation), in bubble average residence time increase and, consequently, in a increase. A k L increase with d 32 decrease is observed, showing the importance of hydrodynamic phenomena on k L , specially, when very low bubbles sizes are presented in oscillatory flow reactors.
TypeArticle
URIhttp://hdl.handle.net/1822/31551
DOI10.1016/j.cej.2014.09.125
ISSN1385-8947
e-ISSN1385-8947
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

Files in This Item:
File Description SizeFormat 
document_18215_1.pdf572,13 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID