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Global and Local Hydrodynamics of Bubble Columns – Effect of Gas Distributor.
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SYSNO ASEP 0454180 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Global and Local Hydrodynamics of Bubble Columns – Effect of Gas Distributor. Author(s) Sharaf, S. (GB)
Zedníková, Mária (UCHP-M) RID, ORCID, SAI
Růžička, Marek (UCHP-M) RID, ORCID, SAI
Azzopardi, B.J. (GB)Source Title Chemical Engineering Journal. - : Elsevier - ISSN 1385-8947
Roč. 288, MAR 15 (2016), s. 489-504Number of pages 16 s. Language eng - English Country CH - Switzerland Keywords bubble columns ; wire mesh sensor ; void fraction Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects LD13018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UCHP-M - RVO:67985858 UT WOS 000370085900051 EID SCOPUS 84956989916 DOI 10.1016/j.cej.2015.11.106 Annotation Global (level swell) and local (WMS – Wire Mesh Sensor) measurements were made on waters of different purities and air, in a cylindrical laboratory bubble column (2 m tall, 0.127 m dia) using two different gas distributors: a perforated plate (to produce homogeneous flow) and a spider sparger (to produce heterogeneous flow). The level swell method provided the steady space-averaged gas holdup/gas flow rate data. The WMS method provided the actual gas holdups and bubble sizes resolved in time and space at one cross-sectional horizontal plane (1 m above distributor), whose integration yields the timeaveraged data. The following results were obtained: The global and local data agree relatively well; there are distinct differences between the radial profiles and bubble size distributions between the two main flow regimes; the local information identifies why the predictions of published models, which account for the smaller and larger bubbles in the flow, may not perform well; the modelling approaches based on the hindrance and enhancement concepts prove to be suitable for the flow regime identification and description, including the transition range between the homogeneous and heterogeneous flows; based on the hydrodynamics, the specific interfacial area is obtained, together with the mass transfer coefficient. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2017
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