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On Stability of a Bubble Column
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SYSNO ASEP 0388399 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On Stability of a Bubble Column Author(s) Růžička, Marek (UCHP-M) RID, ORCID, SAI Source Title Chemical Engineering Research and Design. - : Elsevier - ISSN 0263-8762
Roč. 91, č. 2 (2013), s. 191-203Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords bubble column ; flow regimes ; steady solution Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects GA104/07/1110 GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000315614000001 EID SCOPUS 84872792249 DOI 10.1016/j.cherd.2012.07.011 Annotation The governing equations based on the mass balance of the gas phase in the bubble column were formulated, together with the closures for the two typical operational regimes, homogeneous and heterogeneous. The equations were analysed for the steady state solutions and their stability. Two solutions were found for the uniform regime, one stable and one unstable. Only one stable solution was found for the nonuniform regime. These solutions were investigated as they depend on the control parameters, namely on the gas input, terminal bubble speed, and the form of the closure relations for the collective bubble speed. The two branches of the uniform solution merge in the turning point bifurcation, at large enough gas input. The nonuniform solution branch persists for all plausible parameter values. Besides these physically relevant solutions, one solution branch was identified as physically unacceptable. The physical reasons for the system stability were discussed. The linear approximation of the bubble column dynamics was performed and the relaxation time was estimated. The full nonlinear dynamics was considered too. Both the steady and unsteady behaviour of the bubble column was compared with experimental data. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2014
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