2006
DOI: 10.1016/j.cep.2005.09.002
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Identification of flow regimes and transition points in a bubble column through analysis of differential pressure signal—Influence of the coalescence behavior of the liquid phase

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Cited by 78 publications
(43 citation statements)
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“…Different methods have been presented over the last few decades, as discussed by Shaikh and Al-Dahhan [102], Nedeltchev and Shaikh [26] and Nedeltchev [27]. The most common methods employed are statistical methods (by interpretation of the ε G -U G curve), the swarm velocity [7,11,34,46,[51][52][53]75,76,89,91,229,315,316] and the drift flux [7,11,34,38,46,51,53,75,76,229,[316][317][318] approaches. These methods are based on the analysis of ε G data.…”
Section: The Flow Regimesmentioning
confidence: 99%
“…Different methods have been presented over the last few decades, as discussed by Shaikh and Al-Dahhan [102], Nedeltchev and Shaikh [26] and Nedeltchev [27]. The most common methods employed are statistical methods (by interpretation of the ε G -U G curve), the swarm velocity [7,11,34,46,[51][52][53]75,76,89,91,229,315,316] and the drift flux [7,11,34,38,46,51,53,75,76,229,[316][317][318] approaches. These methods are based on the analysis of ε G data.…”
Section: The Flow Regimesmentioning
confidence: 99%
“…The appearance of the first large bubble is responsible for this sudden increase in swarm velocity and is an indication of flow regime transition. This method has previously been employed by Krishna et al (1991), Letzel et al, (1997), Gourich et al, (2006), Ribeiro and Mewes (2007), Besagni et al (2014 and , 2016a, 2016b. In this study, the quantitative evaluation of U trans is determined by the intersection between the trends of U swarm in the two regimes.…”
Section: Flow Regime Transitionmentioning
confidence: 99%
“…O mesmo comportamento para esta diminuição do valor da entropia de Kolmogorov foi observado por Gourich et al (2006) e Nedeltchev et al (2007 …”
Section: Resultsunclassified
“…A entropia de Kolmogorov indica a taxa de perda de informação ao longo do atrator ou o grau de previsibilidade de pontos ao longo do atrator com evolução do tempo no sistema (GRASSBERGER e PROCACCIA, 1983). Foi verificado que a entropia de Kolmogorov é um parâmetro extremamente útil para quantificar o grau de caos que as colunas de bolhas aparentemente exibem (LETZEL, et al, 1997;VIAL et al, 2000;LIN et al, 2001;GOURICH et al, 2006;NEDELTCHEV et al, 2007;AJBAR et al, 2009;NEDELTCHEV et al, 2011). Grassberger e Procaccia (1983) relatam que a entropia de Kolmogorov maior que zero é uma condição suficiente para o caos, em que o sistema caótico é apenas previsível em um intervalo de tempo limitado.…”
Section: Introductionunclassified