A new methodology to determine k<sub>L</sub>a in airlift reactors based on a non-intrusive image analysis technique

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dc.coverageDOI: 10.1002/jctb.7836
dc.creatorSaleh-Cumsille, Javier
dc.creatorCruz, Pedro
dc.creatorHuiliñir, Cesar
dc.creatorScott, Felipe
dc.creatorVergara-Fernández, Alberto
dc.date2025
dc.date.accessioned2025-11-18T19:50:54Z
dc.date.available2025-11-18T19:50:54Z
dc.description<p>BACKGROUND: This article proposes a new methodology for calculating k<sub>L</sub>a in airlift reactors (ALRs) based on a digital imaging technique and Higbie's model. Four ARLs with different internal diameters (28, 37.4, 45, and 55 mm) were used to determine the aeration patterns, velocities, and size distributions of the bubbles. Video recordings lasting 10 s were recorded using a 1080p slow-motion camera at 240 frames per second (fps). In 100 frames per video, between 500 and 599 frames, the characteristics of the bubbles were captured and then processed using the sci-kit-image Python package. RESULTS: The Higbie model coupled with image analysis was used to determine k<sub>L</sub>, and was then compared with the experimental values and k<sub>L</sub>a correlations. As a result, bubble velocities between 0.2 and 0.8 m s<sup>−1</sup> were determined. CONCLUSIONS: The k<sub>L</sub>a values (20–28 h<sup>−1</sup>) calculated using the new methodology were close to the experimental values and were compared with the correlations for ALRs.</p>eng
dc.identifierhttps://investigadores.uandes.cl/en/publications/8e350ec9-6b77-4334-857f-e3a5163d2a89
dc.identifier.urihttps://repositorio.uandes.cl/handle/uandes/56867
dc.languageeng
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourcevol.100 (2025) nr.7 p.1403-1412
dc.subjectairlift reactor
dc.subjectka determination
dc.subjectoxygen transfer
dc.subjectSDG 7 - Affordable and Clean Energy
dc.titleA new methodology to determine k<sub>L</sub>a in airlift reactors based on a non-intrusive image analysis techniqueeng
dc.typeArticleeng
dc.typeArtículospa
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