Maximum stable bubble size and gas holdup in high‐pressure slurry bubble columns

Luo, Xukun; Lee, D. J.; Lau, Raymond; Yang, Guoqiang; Fan, Liang‐Shih

doi:10.1002/aic.690450402

Cited by 204 publications

(153 citation statements)

References 41 publications

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“…Most of the authors reported a positive effect of the temperature, T c , over ε G [56,86,117,132,177,180,181,[186][187][188]; on the other hand, Pohorecki et al [187] observed no effect of T c -possibly caused by the evaporation-and some authors observed a decrease of ε G T c increased [78,136,189,190]. It is worth noting that the studies reporting a decrease in ε G used at low U G and, in accordance with Yang et al [190], turbulence is low under these conditions,.…”

Section: Temperaturementioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: Temperaturementioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Immediately upstream of the injection tube was a check valve to prevent water from back filling the air supply line between test runs. Fluid properties are known to affect the size distribution with bubble size decreasing with increasing liquid density [21] and decreasing surface tension [22]. Viscosity plays a more complex role [23] as illustrated with reports of increasing [24] and decreasing [25] bubble size with increasing viscosity.…”

Section: Test Facility and Air Injectionmentioning

confidence: 99%

Characterization of Bubble Size Distributions within a Bubble Column

Mohagheghian

Elbing

2018

Fluids

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Abstract:The current study experimentally examines bubble size distribution (BSD) within a bubble column and the associated characteristic length scales. Air was injected into a column of water via a single injection tube. The column diameter (63-102 mm), injection tube diameter (0.8-1.6 mm) and superficial gas velocity (1.4-55 mm/s) were varied. Large samples (up to 54,000 bubbles) of bubble sizes measured via 2D imaging were used to produce probability density functions (PDFs). The PDFs were used to identify an alternative length scale termed the most frequent bubble size (d mf ) and defined as the peak in the PDF. This length scale as well as the traditional Sauter mean diameter were used to assess the sensitivity of the BSD to gas injection rate, injector tube diameter, injection tube angle and column diameter. The d mf was relatively insensitive to most variation, which indicates these bubbles are produced by the turbulent wakes. In addition, the current work examines higher order statistics (standard deviation, skewness and kurtosis) and notes that there is evidence in support of using these statistics to quantify the influence of specific parameters on the flow-field as well as a potential indicator of regime transitions.

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“…The smaller bubbles rise without much interaction even at considerable superficial gas velocities causing a delay in the flow regime transition (Lin et al, 1998;Luo, et al, 1999). In the high pressure systems, even in the churn turbulent flow regime, bubbles of small and narrow size distribution interact to a much smaller extent than the larger bubbles at atmospheric pressures .…”

Section: B) Effect Of Operating Pressurementioning

confidence: 99%

“…The bubble is subjected to breakup when its size exceeds the maximum stable bubble size due to the circulation-induced centrifugal force (Luo et al, 1998a).…”

Section: Bubble Breakup and Maximum Stable Bubble Sizementioning

confidence: 99%

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

Al‐Dahhan¹,

Fan²,

Duduković³

2003

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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...

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Maximum stable bubble size and gas holdup in high‐pressure slurry bubble columns

Cited by 204 publications

References 41 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

Characterization of Bubble Size Distributions within a Bubble Column

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

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