The Impact of Swirls on Slurry Flows in Horizontal Pipelines

Shi, Hang; Yuan, Jianping; Li, Yalin

doi:10.3390/jmse9111201

Cited by 11 publications

(7 citation statements)

References 36 publications

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“…106 The application of swirling flow intensified the turbulence motion, thus improving the dispersion of solid particles and minimizing the wear on the pipe walls and the pipe blockage. 107 Such turbulence motion enhanced the mixing of fluids and, hence, improved the mass transfer performance. 108−110 To induce such swirling flow in microreactors might provide another option to keep a good dispersion of solid (catalyst) particles in the liquid flow and enhance the liquid−solid mass transfer.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

“…The improved transportation of particle-laden liquids has been shown in large-sized conduits through the creation of swirling flow patterns, e.g., using pipes with continuously varying cross sections or attaching helical blades inside pipes . The application of swirling flow intensified the turbulence motion, thus improving the dispersion of solid particles and minimizing the wear on the pipe walls and the pipe blockage . Such turbulence motion enhanced the mixing of fluids and, hence, improved the mass transfer performance. − To induce such swirling flow in microreactors might provide another option to keep a good dispersion of solid (catalyst) particles in the liquid flow and enhance the liquid–solid mass transfer.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

See 1 more Smart Citation

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Zong

Yue

2022

Ind. Eng. Chem. Res.

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The incorporation of flowing nanoparticles or microparticles for use in catalysis as well as in the enhancement of mass transfer in microreactors opens a new avenue for chemical process intensification. In this work, the recent application of handling suspended solid particles in microreactors for carrying out efficient chemical conversions is reviewed, including the use of colloidal suspensions, Pickering emulsions, and catalyst slurries. Emphasis is laid on the effect of the presence of solid particles on the microflow characteristics, mass transfer property, and reaction enhancement, especially in multiphase fluid systems as the most frequently used one in microreactors. A future perspective regarding the potential application of such microreactor systems as well as challenges, especially related to stable flow operation and catalyst recycling, is further provided.

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Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Zong

Yue

2022

Ind. Eng. Chem. Res.

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“…In this study, settling behaviours of slurries in partially filled pipelines was investigated and a correlation for predicting the settling rate of particles was developed based on the experimental data. Shi et al [47] investigated the impact of swirls on slurry flow in horizontal pipelines. The author concluded that increasing the intensity swirls flow from pipe inlet is beneficial to multi-sized slurry transportation because it hinders particles deposition.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

2023

jjmie

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In this study, a model for the prediction of coal particle gradation in horizontal fluid pipeline was developed. The intent of this study is to develop a model that can predict the coal particle gradations in horizontal coal-liquid slurry pipelines. A semiempirical model originally developed by Karabelas has been modified by applying the k-ε approach to model a dimensionless diffusivity, originally assumed to be constant. The mechanistic model developed shows that dimensionless diffusivity is a function of root mean square turbulent velocity fluctuations and many other parameters which include fluid velocity, pipe diameter, carrier fluid and suspended particles densities, particle size, and the efflux concentration. The modified model was compared with four different sets of experimental data and a CFD model, and was found to have overall good agreement. It was employed to analyze particle gradations and the results show that larger coal particles tend to drift to the pipe bed, leaving the upper section of the pipes for smaller particles. The results show that concentration profile of coal particles in single-sized homogenous slurry is different from that of the same particle concentration in multi-sized slurry flow for each particle size and the same efflux concentration. The modified model was applied to analyze the d50 concentration profile and the result shows that d50 concentration profile represents the actual profile accurately within low and moderate range of particle sizes in the slurry. The mechanistic model presented in this study will be useful for coal and other mining industries worldwide, for accurate prediction of concentration profiles and choice of particle sizes as well as flow velocity of slurry in horizontal pipelines to avoid deposition and clogging of particles along the pipeline, thereby reducing associated danger in the pipelines.

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“…The presence of fine particles is found to reduce energy consumption by changing the coarse particle's flow regime. Shi et al [38] carried out simulations on multi-sized slurry flows in the horizontal pipeline under various swirling motions utilizing the Eulerian-Eulerian multiphase model in conjunction with the k-ω SST scheme. The results suggest that an increased level of swirl results in a higher degree of homogeneity of slurry flows.…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, most of the reported research is mainly concerned with the slurry transport for the lab-scale data for Newtonian liquids [34][35][36][37][38]42], while several industrial slurry systems likely exhibit complex non-Newtonian behaviors [43][44][45]. On the other hand, secondary phases like droplets and bubbles play a significant role in industrial scales pipeline transport such as oil sand tailings and mining residuals [46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics investigation of bitumen residues in oil sands tailings transport in an industrial horizontal pipe

Sontti¹,

Sadeghi²,

Zhou³

et al. 2022

Preprint

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Bitumen residues in the oil sand tailings can be a threat to the environment that separating them from tailings before disposal is crucial. This study establishes an Eulerian-Eulerian computational fluid dynamics (CFD) model for an industrial-scale oil sand tailings pipeline. A comprehensive sensitivity analysis was conducted on the selection of carrier-solid and solid-bitumen drag models. The combination of small and large particle sizes (i.e., 75 & 700 µm) and bitumen droplet size (i.e., 400 µm) provided good agreement with field data in velocity profiles and pressure drop. The validated model was subsequently extended to investigate the influence of the secondary phase (i.e., bitumen droplets and bubbles) on flow characteristics in a tailing pipeline. The investigation covered a range of bitumen droplet size (100-400 µm), bitumen fraction (0.0025-0.1), bubble size (5-1000 µm), and bubble fraction (0.0025-0.3) and their influences on the velocity, solids, and bitumen distribution are revealed. For an optimum bubble size of 500 µm, a maximum recovery of 59% from the top 50 % and 83 % from the top 75 % of the pipe cross-section was obtained. The present study demonstrates the preferential distribution of bitumen and provides valuable insight on bitumen recovery from an industrial-scale tailings pipeline.

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The Impact of Swirls on Slurry Flows in Horizontal Pipelines

Cited by 11 publications

References 36 publications

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Implementation of a Model for Predicting the Size Distribution of Coal Particles in a Horizontal Fluid Pipeline

Computational fluid dynamics investigation of bitumen residues in oil sands tailings transport in an industrial horizontal pipe

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