Bubble dynamics investigation in a slurry bubble column

Wu, Chengtian; Suddard, Kelsey; Al‐Dahhan, Muthanna H.

doi:10.1002/aic.11459

Cited by 37 publications

(29 citation statements)

References 22 publications

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“…The common observation about all the above reported works is that they did not provide enough scientific explanation about why increasing solid concentration enhances bubble coalescence except the increase of the apparent viscosity of the slurry phase considered as a pseudo viscous phase. However, solid particles have their intrinsic effect on bubble behavior and this was shown by the findings of Wu et al and Rabha et al…”

Section: Introductionmentioning

confidence: 96%

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

et al. 2019

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The simultaneous effect of particle size and concentration on the total gas holdup of slurry bubble column reactors was investigated in this work. The total gas holdup was measured for air-water-glass beads systems. Three solid concentrations and three particle diameters were used. It was found that increasing particle size at high constant concentration decreases gas holdup. Moreover, increasing solid concentration decreases gas holdup and this decreasing effect is higher for larger particles. Also, solid particles have two effects on hydrodynamics, namely, changing the viscosity and density of the liquid phase as well as hindering the bubbles from rising within the column by the collision phenomenon. Therefore, a novel correcting factor was introduced to correct the gas holdup. The hindering factor considers both the collision efficiency affected by the particle size as well as the solid concentration. A novel correlation was developed to predict the experimental data of the three-phase gas holdup.

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Section: Introductionmentioning

confidence: 96%

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

et al. 2019

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“…A common alternative to d 32 is a probabilistic approach, which uses the mean of the PDF of the bubble chord length [5][6][7][8][9]. This method is most common when the measurements are acquired with electrical impedance/resistivity [10][11][12], wire mesh [13][14][15] or optical [16] point probes, which can only provide a single length scale but a relatively large sample size.…”

Section: Introductionmentioning

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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“…Although one can measure the bubble size and distribution with the particle tracking velocimetry technique in the very dilute (<1%) bubbly flow [32,66], the optical fibre technique is mainly used for bubble detection in bubbly flows [67][68][69][70][71][72][73][74]. The optical probe is a local phase detection device, which can distinguish between water and air.…”

Section: Two-phase (Bubbly) Tc Flowmentioning

confidence: 99%

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

Sun

Zhou

2014

Nonlinearity

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Taylor-Couette (TC) flow and Rayleigh-Bénard (RB) convection are two systems in hydrodynamics, which have been widely used to investigate the primary instabilities, pattern formation, and transitions from laminar to turbulent flow. These two systems are known to have an elegant mathematical similarity. Both TC and RB flows are closed systems, i.e. the total energy dissipation rate exactly follows from the global energy balances. From an experimental point of view, the inherent simple geometry and symmetry in these two systems permits the construction of high precision experimental setups. These systems allow for quantitative measurements of many different variables, and provide a rich source of data to test theories and numerical simulations. We review the various experimental techniques in these two systems in fully developed turbulent states.

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Bubble dynamics investigation in a slurry bubble column

Cited by 37 publications

References 22 publications

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

Simultaneous effect of particle size and solid concentration on the hydrodynamics of slurry bubble column reactors

Characterization of Bubble Size Distributions within a Bubble Column

Experimental techniques for turbulent Taylor–Couette flow and Rayleigh–Bénard convection

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