Zones of different mixing in the liquid phase of bubble columns

Deckwer, Wolf‐Dieter; Graeser, U.; Langemann, Horst; Serpemen, Y.

doi:10.1016/0009-2509(73)85031-6

Cited by 41 publications

(19 citation statements)

References 5 publications

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“…Letzel et al (1997) argue that at the regime transition velocity is established a well ordered flow pattern. Deckwer et al (1973) reported similar result to our QM(UZ)-to-QM(LZ) profile. According to these authors, at the regime transition velocity the liquid-phase backmixing coefficients for both zones are equal, i.e.…”

Section: Flow Regime Identification Based On Quality Of Mixedness (Qm)supporting

confidence: 89%

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Flow Regime Identification in a Bubble Column Based on both Kolmogorov Entropy and Quality of Mixedness Derived from CAERPT Data

2003

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Computer‐automated radioactive particle tracking (CARPT) data obtained in a 0.162 m air‐water bubble column operated at ambient pressure have been analysed. The superficial gas velocity (Ug) has been varied in the range 0.02‐0.12 m/s under constant liquid height 1.04 m. A perforated plate (82 holes ø 0.4 mm, free plate area 0.05 %) distributor has been used. The Kolmogorov entropy (KE) vs. Ug allows identification of the transition velocity (Utrans = 0.064 m/s) between bubbly and transition regimes. KE models for both regimes have been also developed. The quality of mixedness (QM) concept shows that QM(upper zone) ⊕ QM(lower zone) at Utrans = 0.064 m/s.

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Section: Flow Regime Identification Based On Quality Of Mixedness (Qm)supporting

confidence: 89%

“…Our KE-based identification of the regime transition velocity is identical with the findings of other researchers. Deckwer et al (1973), Franz et al (1984) and Lin et al (2001a) argue that the regime transition velocity occurs at about U trans = 0.06 m/s.…”

Section: Resultsmentioning

confidence: 98%

Flow Regime Identification in a Bubble Column Based on both Kolmogorov Entropy and Quality of Mixedness Derived from CAERPT Data

2003

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“…From these plots it has been concluded that the dispersion number (D L / V l L) increases with the superficial gas velocity and decreases with the superficial liquid velocity even though the actual D L increases with both V G and V l as has been observed in this work and reported elsewhere [11,23]. Also the Full Paper dispersion number increases with an increase in the perforated plate percentage free area.…”

Section: Empirical Approachsupporting

confidence: 58%

Liquid Phase RTD Studies in Sectionalized Bubble Column

Palaskar

Pandit³

2000

Chem. Eng. Technol.

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The liquid phase backmixing has been reduced significantly by introducing horizontal perforated sieve plates into a 6.2 cm diameter and 77 cm height and in a 20 cm diameter and 90 cm height bubble columns. For the visbreaking operation of the petroleum residue, where the bubble column is used as soaker such a sectionalization has been suggested. The effect of the introduction of different gas quantities at various axial locations has also been studied to check the effect of increasing gas quantity formed in the visbreaking operation. The nonideality in the liquid phase backmixing has been studied by measuring liquid phase RTD and analysed by using one parameter dispersion model. A new parameter FP (flow parameter) has been defined and a correlation to predict liquid phase dispersion coefficient has been developed which covers the entire range of variables used in the present work.

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“…An interesting identification of the onset of the transition flow regime in bubble columns was presented by Deckwer et al (1973). The authors reported that in the U G range from 0.0024 to 0.062 m/s, zones of different liquid mixing exist.…”

Section: Introductionmentioning

confidence: 97%

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

Nedeltchev

2015

Chemical Engineering Science

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Zones of different mixing in the liquid phase of bubble columns

Cited by 41 publications

References 5 publications

Flow Regime Identification in a Bubble Column Based on both Kolmogorov Entropy and Quality of Mixedness Derived from CAERPT Data

Flow Regime Identification in a Bubble Column Based on both Kolmogorov Entropy and Quality of Mixedness Derived from CAERPT Data

Liquid Phase RTD Studies in Sectionalized Bubble Column

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

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