Hydrodynamic modeling of liquid-solid flow in polyolefin slurry reactors using CFD techniques – A critical analysis

Thakur, Amit K.; Kumar, Rahul; Banerjee, Nilanjana; Chaudhari, Pranava; Gaurav, Gajendra Kumar

doi:10.1016/j.powtec.2022.117544

Cited by 22 publications

(2 citation statements)

References 165 publications

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“…For wall-bound flows with high Reynolds numbers, these wall functions have demonstrated reasonably accurate predictions. Similar models have been used extensively for horizontal pipelines. ,− In the present study, the y + falls within the range of 30 < y + < 300 for the carrier and secondary phases. This validates the logarithmic law for mean velocity within the system.…”

Section: Materials and Methodologymentioning

confidence: 64%

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Huo,

Golchin,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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Our study investigates the segregation of bitumen residues within the transport pipeline before disposal in the presence of coal particles in carriers and microbubbles. Coal particles decreased the bitumen recovery by 17% without the injection of microbubbles. In addition, the improvement in bitumen recovery efficiency by 6 mL of H 2 O 2 is negligible due to a small number of bubbles formed from H 2 O 2 decomposition in the flow. However, tremendous enhancement in the recovery efficiency was achieved with the simultaneous addition of coal particles and H 2 O 2 . Further increase in recovery was noted as a larger volume of H 2 O 2 was injected to form more microbubbles. Computational fluid dynamics (CFD) simulations were conducted to help understand the effects of coal particles and microbubbles. The simulation results illustrated that the introduction of coal particles caused bitumen contents to accumulate in the middle of the pipe. Furthermore, an increased volume fraction of microbubbles contributed to a higher distribution of bitumen at the top of the pipe. This study not only offers valuable insights for developing an innovative strategy to enhance the efficiency of bitumen separation in hydrotransport processes but also contributes to a deeper understanding of the intricate interactions among bubbles, bitumen, and coal particles in a slurry flow.

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Section: Materials and Methodologymentioning

confidence: 64%

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Huo,

Golchin,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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show abstract

“…It captures the key phenomena and trends observed in experiments, allowing researchers to understand the dominant mechanisms and identify critical factors affecting particle behavior. In the present study, we have considered the Luo and Svendsen model for both breakage and agglomeration, followed by previous works. − In practical cases, sand particles can also form agglomerates when bitumen acts as a binder. However, in our CFD–PBM study presented here, we mainly focused on the bitumen residual distribution in the pipeline.…”

Section: Modeling Of Multiphase Flowsmentioning

confidence: 99%

Numerical Insights from a Population Balance Model into the Distribution of Bitumen Residues in Industrial Horizontal Pipes During the Hydrotransport of Oil Sands Tailings

Sontti,

Zhang

2023

Ind. Eng. Chem. Res.

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Pipeline transportation is a vital method for conveying crushed oil sand ores and tailings in the oil sands industry. This study focuses on enhancing economic benefits by exploring the separation of valuable bitumen residues from coarse sand tailings within hydrotransport pipelines. Employing threedimensional transient Eulerian−Eulerian computational fluid dynamics (CFD) simulations coupled with a population balance model (PBM), we examine the aggregation and breakage of bitumen droplets under various flow conditions. The accuracy of the CFD−PBM model is validated against field measurements of velocity profiles and pressure drops. Our findings reveal that higher slurry velocities lead to intensified particle−bitumen interactions, resulting in reduced aggregated bitumen droplet sizes at the pipeline's core. Additionally, variations in bitumen fraction cause shifts in the distribution of coarse particles along the pipe's vertical axis with increased aggregation and larger droplets in the upper region. Notably, we demonstrate that smaller bubbles promote a more uniform distribution of bitumen compared with larger bubbles. These insights provide valuable knowledge for optimizing bitumen recovery processes and facilitate the integration of pipeline hydrotransport dynamics with downstream separation and extraction units.

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Cohesive particle–fluid systems: An overview of their CFD simulation

Marchelli,

Fiori,

Di Felice

2024

Can J Chem Eng

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Solid particles may experience different kinds of cohesive forces, which cause them to form agglomerates and affect their flow in multiphase systems. When such systems are simulated through computational fluid dynamics (CFD) programs, appropriate modelling tools must be included to reproduce this feature. In this review, these strategies are addressed for various systems and scales. After an introduction of the different forces (van der Waals, electrostatic, liquid bridge forces, etc.), the modelling approaches are categorized under three methodologies. For diluted slurries of very fine particles, many researchers succeeded with pseudo‐single phase approaches, employing a model for the non‐Newtonian rheology. This was especially popular for sludges in anaerobic digestions or certain types of soils. In other cases, continuum‐based approaches seem to be more adequate, including cohesiveness in the kinetic theory of granular flows or the restitution coefficient. Geldart‐A particles experiencing van der Waals forces are the primary focus of such studies. Finally, when each particle is modelled as a discrete element, the cohesive force can be directly specified; this is especially widespread for the wet fluidization case. For each of these approaches, a general overview of the main strategies, achievements, and limits is provided.

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Hydrodynamic modeling of liquid-solid flow in polyolefin slurry reactors using CFD techniques – A critical analysis

Cited by 22 publications

References 165 publications

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Effects of Coal Particles on Microbubble-Enhanced Bitumen Separation in the Concentrated Slurry Flow of Oil Sands Tailings

Numerical Insights from a Population Balance Model into the Distribution of Bitumen Residues in Industrial Horizontal Pipes During the Hydrotransport of Oil Sands Tailings

Cohesive particle–fluid systems: An overview of their CFD simulation

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