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Gas−liquid contactors’ aeration capacities when agitated by Rushton turbines of various diameters
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SYSNO ASEP 0523478 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Gas−liquid contactors’ aeration capacities when agitated by Rushton turbines of various diameters Author(s) Kracík, T. (CZ)
Moucha, T. (CZ)
Petříček, Radim (UH-J) RID, ORCID, SAISource Title ACS Omega. - : American Chemical Society - ISSN 2470-1343
Roč. 5, č. 10 (2020), s. 5072-5077Number of pages 6 s. Publication form Online - E Language eng - English Country US - United States Keywords mass transfer ; bubbles ; theoretical and computational chemistry ; Rushton turbine Subject RIV BK - Fluid Dynamics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UH-J - RVO:67985874 UT WOS 000520853400039 EID SCOPUS 85081694628 DOI 10.1021/acsomega.9b04005 Annotation Mass transfer processes are one of the most important operations in chemical, biochemical, and food industries worldwide. In the processes that are controlled by the gas-liquid mass transfer rate, the volumetric mass transfer coefficient kLa becomes a crucial quantity. The dataset was measured with the aim to create a correlation for kLa prediction in a non-coalescent batch under the wide range of experimental conditions. The dynamic pressure method, which was reported as physically correct in the past, was chosen to be the method for experimental determination of kLa. Our previous work targeted the kLa dependencies in viscous and coalescent batches resulting in correlations that are viable for the broad range of process conditions. We reported that the best-fit correlation is based on the hydrodynamic parameter circumferential velocity of impeller blades in the case of non-coalescent liquids in the vessel equipped by single or multiple impellers at a constant D/T ratio (diameter of the impeller to the inner diameter of the tank). Now, we focus on the influence of various impeller diameters on transport characteristics (mainly kLa) in a non-coalescent batch. The experiments are carried out in a multiple-impeller vessel equipped with Rushton turbines (of four diameters) and in both laboratory and pilot-plant scales. Various impeller frequencies and gas flow rates are used. We examine the suitability of the hydrodynamic description, which was reported in the past, to predict kLa also when the D/T ratio changes. We show that the correlation based on the energy dissipation rate better fits the experimental data and predicts kLa values more accurately in the case of varying D/T values. This correlation could be adopted in the design and scale-up of agitated devices operating with non-coalescent batches. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0307838
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