Effect of pressure on the drag coefficient of individual bubbles in a contaminated polydisperse swarm

Mach, Jacob; Wiens, Jason; Adjaye, John; Donaldson, Adam; Macchi, Arturo

doi:10.1016/j.ces.2020.115728

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…Our previous work demonstrated that the drag coefficient of an individual bubble in a contaminated polydisperse swarm decreases with pressure at constant gas holdup. This observation was attributed to changes in bubble size distribution caused by pressure.…”

Section: Results and Discussionmentioning

confidence: 96%

“…The dimensionless pressure ( p ′) was thus normalized by Eo to better capture this effect. Estimated model parameters for a single bubble cap plate are compared to those of a perforated plate from our previous work in Table . Figure compares model predicted drag coefficients to their corresponding experimental values.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The selected operating conditions span the dispersed bubble flow regime only (U G < 0.05 m/s), where the impact of gas−liquid distributor is most significant. Furthermore, the selected operating pressures are lower than the industrial value (∼11.7 MPa), and this is justified because the impact of pressure on bubble properties and dynamics was determined in Mach et al 36 to level off around 2 MPa.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…While bubble size and resulting holdup from single phase distributors can be fairly constant beyond some critical orifice diameter, 44 this is unlikely the case for the twophase bubble cap distributor due to (i) sudden changes in magnitude and direction of fluids velocities and (ii) simultaneous bubble breakage and coalescence under elevated dispersed phase holdups. Our previous work 36 demonstrated that the drag coefficient of an individual bubble in a contaminated polydisperse swarm decreases with pressure at constant gas holdup. This observation was attributed to changes in bubble size distribution caused by pressure.…”

Section: Chord Length Distributions (Cld)mentioning

confidence: 96%

“…Res. 2020, 59, 19712−19725for a single bubble cap plate are compared to those of a perforated plate from our previous work36 in Table8. Figure17compares model predicted drag coefficients to their corresponding experimental values.…”

mentioning

confidence: 99%

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Fluid Dynamics Scaling of a Gas–Liquid Distributor Applied to a Commercial Ebullated Bed Hydroprocessor

Mach

Wiens

Adjaye

et al. 2020

Ind. Eng. Chem. Res.

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A new scaling approach for a gas–liquid distributor is proposed and experimentally validated on a commercial bubble cap geometry. The geometric similarity was achieved by matching distributor fractional opening and ratios of various critical dimensions. The dynamic similarity was attained by matching three dimensionless groups (gas–liquid density ratio, liquid Reynolds number, and gas Froude number) and bubble coalescence behavior. Two geometrically similar distributors with one and three smaller bubble caps were experimentally compared through resulting bubble size distributions to test the scaling laws. A reasonably good agreement was found at various pressures, suggesting that the scaling approach could also work at industrially relevant conditions. New models for bubble size distribution and drag coefficient were developed to explicitly account for the effect of the gas–liquid distributor and thus improve the fluid dynamics modeling of commercial ebullated bed hydroprocessors.

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Section: Results and Discussionmentioning

confidence: 96%

Section: Results and Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Chord Length Distributions (Cld)mentioning

confidence: 96%

mentioning

confidence: 99%

See 3 more Smart Citations

Fluid Dynamics Scaling of a Gas–Liquid Distributor Applied to a Commercial Ebullated Bed Hydroprocessor

Mach

Wiens

Adjaye

et al. 2020

Ind. Eng. Chem. Res.

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Modeling of Dual‐Factor Drag Correction Model for Bubbly Flow under Elevated Pressure

Gao,

Geng,

Verdin

et al. 2024

Chem Eng & Technol

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A pressure correction method is proposed considering the influence of a dual factor. The applicability of a pressure correction method coupled with a drag model is discussed along with the accuracy of the simulation results obtained by such a pressure correction method. It is found that the present pressure correction method combined with the DBS (dual bubble size) drag model can accurately reflect the changing trend of gas holdup distribution with pressure. It is also established that results from this model applied to a bubble column match well with the experimental data. Finally, when compared with other pressure correction models, the proposed model shows better robustness in three‐dimensional simulations and can predict radial gas holdup distributions with better accuracy.

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Investigation into drag coefficient for sub-millimeter bubbles in gas–liquid bubbly flow: Experiments and CFD simulations

Li,

Cui,

Zhai

et al. 2023

Chemical Engineering Journal

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Effect of pressure on the drag coefficient of individual bubbles in a contaminated polydisperse swarm

Cited by 14 publications

References 27 publications

Fluid Dynamics Scaling of a Gas–Liquid Distributor Applied to a Commercial Ebullated Bed Hydroprocessor

Fluid Dynamics Scaling of a Gas–Liquid Distributor Applied to a Commercial Ebullated Bed Hydroprocessor

Modeling of Dual‐Factor Drag Correction Model for Bubbly Flow under Elevated Pressure

Investigation into drag coefficient for sub-millimeter bubbles in gas–liquid bubbly flow: Experiments and CFD simulations

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