Some properties of a packed bubble column

Carleton, A. J.; Flain, Robert J; Rennie, J. K.; Valentin, Finn

doi:10.1016/0009-2509(67)80214-8

Cited by 58 publications

(19 citation statements)

References 6 publications

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“…Dunn et al [21] found that axial mixing decreases with increasing liquid velocities, but no significant variation with the velocity of the gas was observed. The dependence on the gas velocity was hardly observed by Hoogendoorn and Lips [22] and Carleton et al [23]. In this work, the best agreement was found with the correlation of Otake and Kunugita…”

Section: Vsg Mlssupporting

confidence: 78%

Comparison of hydrodynamic parameters for countercurrent and cocurrent flow through packed beds

et al. 1997

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Hydrodynamic parameters have been determined in common equipment, i.e., same column and liquid and gas distributors, for cocurrent and countercurrent two-phase flow through fixed beds. The piston/dispersion exchange model (PDE) with usual Danckwerts' boundary conditions (closed/closed system) has been used to describe the liquid flow. A new imperfect pulse method has been used to estimate the PDE model parameters directly from the experimentally nonideal input and output response. The transition between trickle flow and pulse flow, for two-phase downflow, and the occurrence of flooding, for countercurrent flow, has been investigated using a macroscopic model for the two-phase flow.

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Section: Vsg Mlssupporting

confidence: 78%

Comparison of hydrodynamic parameters for countercurrent and cocurrent flow through packed beds

et al. 1997

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“…Comparing our results with the studies focusing on the influence of internals (Carleton et al, 1967;Jhawar and Prakash, 2014;O'Dowd et al, 1987;Yamashita, 1987)-the reader may refer to the literature review in the introduction-it is clear that the changes to the holdup highly depend upon the internal layout and column design. …”

Section: Resultsmentioning

confidence: 69%

“…However, these differences are very limited, suggesting that the presence of the internals has a negligible effect on the holdup curves. Investigation dealing with the comparison of the holdup for the case with and without internals and with U L ¼0 m/s have been performed by Carleton et al (1967), Yamashita (1987), O'Dowd et al (1987) and Jhawar and Prakash (2014). Carleton et al, Yamashita et al and O'Down et al reported an increase of the holdup in the annular gap configuration.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, few studies concerning the hydrodynamic of bubble columns with internals can be found in the literature. Carleton et al (1967) studied different column diameter (0.076 m, 0.153 m and 0.305 m) with different internal tubes (with size ranging from 0.025 to 0.076 m). The authors reported an increase of the holdup in the annular gap configuration.…”

Section: Introductionmentioning

confidence: 99%

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Influence of internals on counter-current bubble column hydrodynamics: Holdup, flow regime transition and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

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However, in most industrial applications, internal devices are often added to control heat transfer, to foster bubble break-up or to limit liquid phase back mixing. These elements can have significant effects on the multiphase flow inside the bubble column reactor and the prediction of these effects is still hardly possible without experimentation. In this paper, we study experimentally a counter-current gas-liquid bubble column in the open tube and annular gap configurations. In the annular gap bubble column, two vertical internal tubes are considered. The column has an inner diameter of 0.24 m, and the global and local hydrodynamic properties are studied using gas holdup measurements and a double-fiber optical probe. The gas holdup measurements are compared with the literature and used to investigate the flow regime transition. A double-fiber optical probe is used to acquire midpoint data and radial profiles of the local properties to study the flow properties and to further investigate the flow regime transition. The counter-current mode is found to increase the holdup, decrease the bubble velocity and cause regime transition at lower superficial gas velocity. The holdup curves in the annular gap and open tube configurations are similar in shape and values, suggesting that the presence of internals has a limited influence on the global hydrodynamic. In addition, it is found that the presence of the internals stabilizes the homogeneous regime in terms of transition gas velocity and holdup.

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“…The residence time distribution (RTD) in the gas phase can be conveniently used for discriminating between the two models. Most available literature on gas phase mixing (Carleton et al [6], Towel1 and Ackerman [7], Field and Davidson [8], Wachi and Nojima [9]) indicates that the RTD of the gas phase in bubble columns can be well described by the single-bubble-class model. Recently, Kawagoe et al [lo] correlated their RTD data according to the two-bubble-class model, whereby they subjected three parameters, i.e.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the gas phase in bubble columns

1993

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The conventional two-bubble-class model for bubble column reactors has been modified to account for interactions between the two bubble classes. It is shown that the modified model is more consistent with the observed residence time distribution in the gas phase than the conventional model. The results indicate that there is an intensive cross-mixing between the bubble phases. This study also reveals that the modified two-bubble-class model cannot be distinguished from the single-bubble-class model solely on the basis of the residence time distribution.

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Some properties of a packed bubble column

Cited by 58 publications

References 6 publications

Comparison of hydrodynamic parameters for countercurrent and cocurrent flow through packed beds

Comparison of hydrodynamic parameters for countercurrent and cocurrent flow through packed beds

Influence of internals on counter-current bubble column hydrodynamics: Holdup, flow regime transition and local flow properties

Dynamics of the gas phase in bubble columns

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