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Abstract
Gas-phase holdup is measured in a 0·305 m diameter bubble column at ambient temperature and pressure as a function of superficial gas velocity. An air-water system is investigated for two values (1.35 m and 2.45 m) of the slumped water column height and air velocity in the range 0–0·3 m/s. The data are examined on the basis of models developed on the concept that the gas-phase flow in the bubble column may be mimicked in terms of two classes of bubble populations, viz. small and large. This is well described in a paper by Krishna el al. [6], The model has three parameters U g,trans, U b,SB and E g,trans and a procedure to predict the large bubble population holdup. Based on experimental data correlations for these parameters have been proposed by Ellenberger and Krishna [16]; Wilkinson et al. [21]; Krishna and Ellenberger [22] and Reilly el al. [23]. All these models and correlations have been examined and assessed on the basis of experimental gas-phase holdup data generated in this effort. Correlations of Smith Iel alI. [19] and Reilly et al. [20] are also examined. A model based on the drift-flux theory is developed and successfully tested on new data and those of Krishna and coworkers developed in recent years. Saxena and Chen [3, 5] have shown the ability of this model to correlate most of the data reported in the literature.