Dynamic gas disengagement: A new technique for assessing the behaviour of bubble columns

Sriram, K.; Mann, R.

doi:10.1016/0009-2509(77)80222-4

Cited by 98 publications

(56 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The mean residence of large bubbles is much smaller than that of small bubbles. Many investigators (Sriram and Mann, 1977;Vermeer and Krishna, 1981;Schumpe and Deckwer, 1982;Godbole et al, 1982Godbole et al, , 1984Kelkar et al, 1983;Joseph and Shah, 1984;Schumpe and Grund, 1986;Molerus and Kurtin, 1986;Mikio and Tsutao, 1988;Patel et al, 1989) have also observed two distinct bubble classes in the churn-turbulent regime of operation in bubble columns. Vermeer and Krishna (1981) studied the hydrodynamics and mass transfer in the churn-turbulent regime in an organic liquid using the two-bubble-class model and concluded that the gas transport in this regime occurred exclusively due to large bubbles.…”

Section: Literature Reviewmentioning

confidence: 91%

See 1 more Smart Citation

Gas‐phase backmixing in bubble‐column reactors

1992

View full text Add to dashboard Cite

show abstract

Section: Literature Reviewmentioning

confidence: 91%

“…All of the above researchers have used the dynamic gas disengagement (DGD) technique, which was first proposed by Sriram and Mann (1977), to measure the individual bubbleclass holdups. This technique requires sophisticated equipment to monitor the dispersion height as a function of time after the gas supply has been stopped.…”

Section: Literature Reviewmentioning

confidence: 99%

Gas‐phase backmixing in bubble‐column reactors

1992

View full text Add to dashboard Cite

show abstract

“…The technique was first used by Sriram and Mann (1977). It required an accurate measurement of the rate at which the level of gas-liquid dispersion dropped once the gas flow was closed.…”

Section: Gas Disengagement Techniquementioning

confidence: 99%

Heat Transfer and Hydrodynamics in a Three-Phase Slurry Bubble Column

Prakash

1997

Ind. Eng. Chem. Res.

102

View full text Add to dashboard Cite

The instantaneous and time-averaged heat transfer coefficients in the regions near the wall and at the center and average gas holdups were measured in a 0.28 m diameter slurry bubble column for the air−water and air−water−glass beads (35 μm) system. The effects of high gas velocities (up to 0.35 m/s) and high solids concentrations (up to 40 vol %) were investigated. Gas holdup decreased with increasing slurry concentrations; the rate of decline was rapid at high gas velocities. The instantaneous local heat transfer measurements were analyzed to study the bubble behavior in the regions near the wall and at the center for different solids concentrations. Larger bubbles were detected in the wall region in slurry systems compared to the solid-free system. The average heat transfer coefficient decreased with increasing slurry concentrations. The heat transfer coefficient was always lower at the wall than at the center.

show abstract

“…The dynamic gas disengagement technique, first applied in bubble columns by Sriram and Mann (1977), is utilized to measure the gas holdup in a slurry bubble column under wide operating conditions (Lee et al, 1998). The results obtained with this technique for high-pressure systems are given in Luo et al (1998a).…”

Section: Overall Gas Holdup and Hydrodynamic Similaritymentioning

confidence: 99%

Advanced Diagnostic Techniques for Three-Phase Slurry Bubble Column Reactors(sbcr)

Al‐Dahhan¹,

Fan²,

Duduković³

2003

View full text Add to dashboard Cite

The objectives set for this cooperative project between Washington University (WU), Ohio State University (OSU), and Air Products and Chemicals, Inc. (APCI) to advance the understanding of the Fischer-Tropsch (FT) slurry bubble column reactor hydrodynamics for proper design and scale-up via advanced diagnostic techniques have been accomplished successfully despite the unexpected challenging technical difficulties in implementing the advanced techniques in high pressure stainless steel slurry bubble column.In this work, a detailed review of the aspects of high pressure phenomena of bubbles in liquids and liquid-solids suspension was performed. All the challenging technical problems mentioned above were resolved and the advanced measurement techniques were successfully used in this project. The effects of reactor pressure, superficial gas velocity, solids loading, and liquid physical properties on the overall gas holdup, holdups distribution, recirculation velocity, turbulent parameters, bubble dynamics (size and rise velocity) were investigated via advanced measurement techniques that includes optical probe, Laser Doppler Anemometry (LDA), Computed Tomography (CT), Computer Automated Radioactive Particle Tracking (CARPT). The findings are discussed and analyzed in this report. In attempt to advance the design and scale-up of bubble columns, new correlations have been developed based on a large bank of data collected at a wide range of operating and design conditions. These correlations are for prediction of radial gas holdup profile, axial liquid velocity profile, overall gas holdup based on Neural Network and gas-liquid mass transfer coefficient.Despite the noticeable advances made on FT SBCR as a part of this project, there are still many parameters and challenging issues that need to be further and properly investigated and understood before this technology will be readily used for alternative fuel development technology. iv ADVANCED DIAGNOSTIC TECHNIQUES FOR THREE-PHASE SLURRY BUBBLE COLUMN REACTORS (SBCR)Final Technical Report DE-FG-26-99FT40594 Bubble column reactor of 6" without ports used for CARPT/CT measurements. CT1, CT2, CT3 represents the scan levels used in this investigation 30 Figure 3. 4 Bubble column reactor of 6" with ports used for overall gas holdup and DP measurements. CT1, CT2, CT3 represents the scan levels used in this investigation. 31 Effect of superficial gas velocity on gas holdup profile (airwater-glass beads 150 (µm) in 6" column with 9.1 % vol. solids loading at 0.1 MPa 50 Figure 4.10 Effect of superficial gas velocity on solids axial velocity profile (air-water-glass beads 150 µm) in 6" column with 9.1 % vol. solids loading at 0.1 MPa 50 Figure 4.11 Effect of superficial gas velocity on solids shear stress profile (air-water-glass beads 150 µm) in 6" column with 9.1 % vol. solids loading at 0.1 MPa 50 Figure 4.12 Effect of superficial gas velocity on TKE (air-water-glass beads 150 µm) in 6" column with 9.1 % vol. solids loading at 0.1 MPa 51 Figure 4.13 Effect of superf...

show abstract

Dynamic gas disengagement: A new technique for assessing the behaviour of bubble columns

Cited by 98 publications

References 8 publications

Gas‐phase backmixing in bubble‐column reactors

Gas‐phase backmixing in bubble‐column reactors

Heat Transfer and Hydrodynamics in a Three-Phase Slurry Bubble Column

Advanced Diagnostic Techniques for Three-Phase Slurry Bubble Column Reactors(sbcr)

Contact Info

Product

Resources

About