Study of hydrodynamic behaviour in bubble columns and external loop airlift reactors through analysis of pressure fluctuations

Vial, Christophe; Camarasa, E.; Poncin, Souhila; Wild, Gabriel; Midoux, N.; Bouillard, Jacques

doi:10.1016/s0009-2509(99)00551-5

Cited by 157 publications

(135 citation statements)

References 23 publications

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“…The hydrodynamics properties can be used in finding an alternative method of fluid mixing by focusing on bubble flow pattern inside the bubble column. This was proofed by Vial et al which emphasize that the hydrodynamic and phase mixing depend strongly on the prevailing flow pattern (Vial et al, 2000).…”

Section: Introductionmentioning

confidence: 78%

Flow visualization of bubble structure in bubble column reactor for fluid mixing

Ibrahim¹,

Khalid²,

Zaman³

et al. 2017

AIP Conference Proceedings

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Bubble columns reactor is widely used as gas-liquid mixing and as reactors in many industries such as in chemical, petrochemical and biochemical. High interfacial area between the gas and liquid phase will enhanced an effective mixing, leading to improved heat and mass transfer characteristics under bubble columns become an attractive choice as reactors for the described processes. In this research, experimental work by using cylindrical acrylic bubble column with internal diameter of 0.15m and height of 1m was done. The bubble column is equipped by four nozzles with orifice diameter of 5 mm function as gas distributor attach at the bottom of the column. For this study, gas phase and liquid phase used are air and water respectively. The investigated variable parameter was mechanism of bubble formation, regime analysis and the relationship between superficial gas holdup and gas holdup. The techniques used in collecting data were visual observation, measurement technique and photographic method. The result showed that there were five stage of bubble formation based on experiment conducted. For gas holdup and superficial gas velocity relationship, it was discovered that the gas holdup increased with the increasing of superficial gas velocity. The relationship was proof to be in good agreement with published data proposed by previous researcher. .

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Section: Introductionmentioning

confidence: 78%

Flow visualization of bubble structure in bubble column reactor for fluid mixing

Ibrahim¹,

Khalid²,

Zaman³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

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“…(2.1)) is also used to distinguish the the various flow regimes by plotting -Hi. as a function of U g (Zahradnik et al, 1997;Vial et al, s 2000;Camarasa et al, 2001), as shown in Figure 2.6b. This model has also been successfully used to demarcate flow regimes in gas-liquid-solid systems (Gandhi et al, 1999).…”

Section: Flow Regime Identificationmentioning

confidence: 87%

“…The drift flux analysis of Wallis (1969) has been recommended to identify flow regimes (Vial et al, 2000). In a semi-batch bubble column, the drift flux, j g is defined as j, = U,(l -s) (2.5)…”

Section: Flow Regime Identificationmentioning

confidence: 99%

“…Recently, pressure fluctuation analysis was used by Vial et al (2000), Camarasa et al (1999), and Lin et al (2001) to identify flow regimes. Vial et al (2000) applied statistical analysis, spectral analysis, fractal analysis, and chaos analysis to the varying pressure signals, and concluded that statistical analysis was not superior to the drift flux model analysis, and spectral analysis could identify a particular regime but could not precisely determine flow regime transition.…”

Section: Flow Regime Identificationmentioning

confidence: 99%

“…Vial et al (2000) applied statistical analysis, spectral analysis, fractal analysis, and chaos analysis to the varying pressure signals, and concluded that statistical analysis was not superior to the drift flux model analysis, and spectral analysis could identify a particular regime but could not precisely determine flow regime transition. Fractal and chaos analysis was shown to accurately identify regime limits.…”

Section: Flow Regime Identificationmentioning

confidence: 99%

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Bioreactors: Airlift Reactors

Merchuk

Camacho

2010

Encyclopedia of Industrial Biotechnology

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ALRs are popular in modern bioprocess research and development and, in many cases, they have found industrial uses. The distinctive characteristics of ALRs are conferred by the fluid dynamics of the liquid‐gas or liquid gas‐solid mixtures: holdup, liquid velocity, and mixing in the riser, gas separator, and downcomer. Only a correct understanding of the interconnection of these regions can make possible the scale‐up of a laboratory device, to pilot or industrial size. Several correlations are available in the literature for the prediction of the fluid dynamic characteristics of the reactor and of the mass and heat transfer coefficients, and a selection is presented in this review. Significant progress has been made in the application of modern computational tools to the simulation and design of ALRs. In parallel, innovative and sophisticated methods have been applied to obtain a deeper insight into the mechanisms of fluid motion and the flow patterns in the reactor. However, no single research group has managed to cover all the variables over a wide range. The engineer confronting scale‐up or de novo design of an ALR must analyze the validity of the correlations and computation methods used for the calculations.

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Study of hydrodynamic behaviour in bubble columns and external loop airlift reactors through analysis of pressure fluctuations

Cited by 157 publications

References 23 publications

Flow visualization of bubble structure in bubble column reactor for fluid mixing

Flow visualization of bubble structure in bubble column reactor for fluid mixing

Gas holdup in a gas-liquid-fiber semi-batch bubble column

Bioreactors: Airlift Reactors

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