Positron emission particle tracking (PEPT): A novel approach to flow visualisation in lab-scale anaerobic digesters

Sindall, Rebecca; Dapelo, Davide; Leadbeater, Thomas; Bridgeman, John

doi:10.1016/j.flowmeasinst.2017.02.009

Cited by 23 publications

(10 citation statements)

References 22 publications

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“…The Euler-Lagrange model for gas-mixing in anaerobic digestion developed and validated with lab-scale data in [25,26] was adopted for the work presented within this article.…”

Section: Multiphase Modelmentioning

confidence: 99%

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Euler-Lagrange Computational Fluid Dynamics simulation of a full-scale unconfined anaerobic digester for wastewater sludge treatment

Dapelo

Bridgeman

2018

Advances in Engineering Software

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For the first time, an Euler-Lagrange model for Computational Fluid Dynamics (CFD) is used to model a full-scale gas-mixed anaerobic digester. The design and operation parameters of a digester from a wastewater treatment works are modelled, and mixing is assessed through a novel, multi-facetted approach consisting of the simultaneous analysis of (i) velocity, shear rate and viscosity flow patterns, (ii) domain characterization following the average shear rate value, and (iii) concentration of a non-diffusive scalar tracer. The influence of sludge's non-Newtonian behaviour on flow patterns and its consequential impact on mixing quality were discussed for the first time. Recommendations to enhance mixing effectiveness are given: (i) a lower gas mixing input power can be used in the digester modelled within this work without a significant change in mixing quality, and (ii) biogas injection should be periodically switched between different nozzle series placed at different distances from the centre.

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“…The Euler-Lagrange model for gas-mixing in anaerobic digestion developed and validated with lab-scale data in [25,26] was adopted for the work presented within this article.…”

Section: Multiphase Modelmentioning

confidence: 99%

“…This model successfully described a laboratory-scale setup with a much reduced amount of empirical information when compared to the Euler-Euler model. Validations were performed through Particle Image Velocimetry [25] and Positron Emission Particle Tracking [26] techniques.…”

Section: Introductionmentioning

confidence: 99%

Euler-Lagrange Computational Fluid Dynamics simulation of a full-scale unconfined anaerobic digester for wastewater sludge treatment

Dapelo

Bridgeman

2018

Advances in Engineering Software

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“…The main reason is that AD sludge is highly opaque and cannot permit the use of conventional flow visualization techniques. For biogas mixing and mechanical stirring, some studies used nonintrusive flow visualization techniques such as computer automated radioactive particle tracking, and Positron emission particle tracking …”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic analysis of an axial impeller in a non‐Newtonian fluid through particle image velocimetry

2020

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The rheology of non-Newtonian fluids in agitated vessels is complex making equipment sizing more an art than a science. To increase our understanding and to resolve the data gap for computational fluid dynamics validation, we present a detailed particle image velocimetry study of the hydrodynamics of Carbopol encountered in a 70 L mechanically mixed (A310) tank at three different rotational speeds (100, 250, 500 rpm). Bulk flow visualizations show that the flow field below the impeller is highly influenced by the rheological behavior of the fluid. Moreover, an analysis of the shear rate and viscosity revealed important spatial heterogeneities. An estimation of the Reynolds number classified the rotational speeds as the onset of the transitional regime (100), in the transitional regime (250) and turbulent conditions (500 rpm). This data set consists of local mean and fluctuating velocities at different locations below the impeller, which are available for validation and further study. K E Y W O R D SCarbopol, mechanical mixing, particle image velocimetry, proper orthogonal decomposition, shear rate

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“…With technological progress, CFD has become a powerful method for the simulation of complex flow phenomena. Almost all flow field parameters can be obtained at the same time by CFD [25][26][27][28][29]. Cui et al [30,31] investigated the flow field and air core characteristics with water-only condition by using the RSM (Reynolds Stress Model) and VOF (Volume of Fluid), and it showed a good agreement between simulation and PIV measurement results.…”

Section: Introductionmentioning

confidence: 99%

Effect of Overflow Pipe on the Internal Flow Fields and Separation Performance of W-Shaped Hydrocyclones

et al. 2020

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The entrainment of fine particles in underflow of a grinding-classification hydrocyclone can cause ore overgrinding, which will lead to reductions in both metal recovery and ball mill throughput. To address this problem, this paper proposed a W-shaped hydrocyclone that can effectively reduce underflow fine particle entrainment. Experimental tests and numerical simulations were employed to deeply investigate overflow pipe diameter influence on the separation performance and internal flow field of W-shaped hydrocyclones. The effects of overflow pipe diameter on air core shape, velocity field, pressure field, and separation performance were studied. The results revealed that as the diameter of the overflow pipe increased, air core gradually stabilized, and air core diameter gradually increased. The diameter of stabilized air core was approximately 45% to 55% of overflow pipe diameter. As overflow pipe diameter increased, hydrocyclone pressure drop decreased, energy consumption was reduced, the tangential velocity decreased, outer vortex axial velocity did not change significantly, and inner vortex axial velocity gradually increased. At the same time, zero-velocity points gradually moved outward, and the inner vortex region expanded. By the increase of overflow pipe diameter, both the underflow yield and split ratio gradually decreased, the coarse particle content in the overflow product increased, and the fine particle content in the underflow product gradually decreased.

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Positron emission particle tracking (PEPT): A novel approach to flow visualisation in lab-scale anaerobic digesters

Cited by 23 publications

References 22 publications

Euler-Lagrange Computational Fluid Dynamics simulation of a full-scale unconfined anaerobic digester for wastewater sludge treatment

Euler-Lagrange Computational Fluid Dynamics simulation of a full-scale unconfined anaerobic digester for wastewater sludge treatment

Hydrodynamic analysis of an axial impeller in a non‐Newtonian fluid through particle image velocimetry

Effect of Overflow Pipe on the Internal Flow Fields and Separation Performance of W-Shaped Hydrocyclones

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