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| Titel: |
HYDRODYNAMICS OF UNBAFFLED BUBBLE COLUMNS: GAS-PHASE HOLDUP |
| Auteur: |
Zhu, J. W. Saxena, S. C. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 173 (1999) nr. 1 pagina's 103-122 |
| Jaar: |
1999-06-01 |
| Inhoud: |
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 Ug,trans, Ub,SB and Eg,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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 8 gevonden artikelen
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