On the estimation of the regime transition point in bubble columns

New methods for flow regime identification in bubble columns and fluidized beds

“…Wang et al (2005) theoretically predicted the flow regime transition in bubble columns by the population balance model. Ribeiro (2008) has also derived a correlation for prediction of the regime transition point in bubble columns. However, it is not frequently used.…”

Hydrodynamics of Ionic Liquids in Bubble Columns

“…For the estimation of the gas holdup, there exists a vast number of equations in the open literature, most of which are empirically based. In the review by [35], 37 published equations for gas holdup are listed. In selecting equations to predict gas holdup overall correlations based on experimental data is often used, despite the fact that it is generally better to use more physically based methods since empirical correlations are usually most suited for the experimental conditions which they were developed from.…”

Flow Regime Identification in a Bubble Column via Nuclear Gauge Densitometry and Chaos Analysis

“…Semi-theoretical transition criteria have been developed by Shnip et al [8], Ruzicka and Thomas [9], and Thorat and Joshi [10]. Ribeiro [11] proposed new empirical formulas for estimating the gas superficial velocity at the point of regime transition in bubble columns and the corresponding gas holdup. Earlier, Kelkar [12] developed a correlation for the transition velocity based on the concept of slip velocity.…”