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@article{40d29063fb4d4d4994fa806cabda42ea,
title = "Characterising the two-phase flow and mixing performance in a gas-mixed anaerobic digester: Importance for scaled-up applications",
abstract = "This study aimed to characterise the gas-liquid flow and mixing behaviour in a gas-mixed anaerobic digester by improving phase interaction modelling using Computational Fluid Dynamics (CFD). A 2D axisymmetric model validated with experimental data was set up using an Eulerian-Eulerian method. Uncertainty factors, including bubble size, phase interaction forces and liquid rheology were found to significantly influence the flow field. A more reliable and complete validation was obtained by critical comparison and assessment of the referred experimental data, compared to the models reported in other studies. Additionally, justifiable corrections and predictions in detail were obtained. Mixing was evaluated by trajectory tracking of a large number of particles based on an Euler-Lagrange method. The mixing performance approximated to a laminar-flow reactor (LFR) that distinctly deviated from expected continuous stirred tank reactor (CSTR) design, indicating limited enhancement from the applied gas-sparging strategy in the studied digester. The study shows the importance of a proper phase-interaction description for a reliable hydrodynamic characterisation and mixing evaluation in gas-mixed digesters. Validations, bend to experimental data without a critical assessment, may lead to an inaccurate model for further scaled-up applications.",
keywords = "Anaerobic digestion, CFD, Hydrodynamics, Mixing, Two-phase flow",
author = "Peng Wei and Mudde, {Robert F.} and Wim Uijttewaal and Henri Spanjers and {van Lier}, {Jules B.} and {de Kreuk}, Merle",
year = "2019",
doi = "10.1016/j.watres.2018.10.077",
language = "English",
volume = "149",
pages = "86--97",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Characterising the two-phase flow and mixing performance in a gas-mixed anaerobic digester

T2 - Water Research

AU - Wei, Peng

AU - Mudde, Robert F.

AU - Uijttewaal, Wim

AU - Spanjers, Henri

AU - van Lier, Jules B.

AU - de Kreuk, Merle

PY - 2019

Y1 - 2019

N2 - This study aimed to characterise the gas-liquid flow and mixing behaviour in a gas-mixed anaerobic digester by improving phase interaction modelling using Computational Fluid Dynamics (CFD). A 2D axisymmetric model validated with experimental data was set up using an Eulerian-Eulerian method. Uncertainty factors, including bubble size, phase interaction forces and liquid rheology were found to significantly influence the flow field. A more reliable and complete validation was obtained by critical comparison and assessment of the referred experimental data, compared to the models reported in other studies. Additionally, justifiable corrections and predictions in detail were obtained. Mixing was evaluated by trajectory tracking of a large number of particles based on an Euler-Lagrange method. The mixing performance approximated to a laminar-flow reactor (LFR) that distinctly deviated from expected continuous stirred tank reactor (CSTR) design, indicating limited enhancement from the applied gas-sparging strategy in the studied digester. The study shows the importance of a proper phase-interaction description for a reliable hydrodynamic characterisation and mixing evaluation in gas-mixed digesters. Validations, bend to experimental data without a critical assessment, may lead to an inaccurate model for further scaled-up applications.

AB - This study aimed to characterise the gas-liquid flow and mixing behaviour in a gas-mixed anaerobic digester by improving phase interaction modelling using Computational Fluid Dynamics (CFD). A 2D axisymmetric model validated with experimental data was set up using an Eulerian-Eulerian method. Uncertainty factors, including bubble size, phase interaction forces and liquid rheology were found to significantly influence the flow field. A more reliable and complete validation was obtained by critical comparison and assessment of the referred experimental data, compared to the models reported in other studies. Additionally, justifiable corrections and predictions in detail were obtained. Mixing was evaluated by trajectory tracking of a large number of particles based on an Euler-Lagrange method. The mixing performance approximated to a laminar-flow reactor (LFR) that distinctly deviated from expected continuous stirred tank reactor (CSTR) design, indicating limited enhancement from the applied gas-sparging strategy in the studied digester. The study shows the importance of a proper phase-interaction description for a reliable hydrodynamic characterisation and mixing evaluation in gas-mixed digesters. Validations, bend to experimental data without a critical assessment, may lead to an inaccurate model for further scaled-up applications.

KW - Anaerobic digestion

KW - CFD

KW - Hydrodynamics

KW - Mixing

KW - Two-phase flow

UR - http://www.scopus.com/inward/record.url?scp=85056248636&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2018.10.077

DO - 10.1016/j.watres.2018.10.077

M3 - Article

VL - 149

SP - 86

EP - 97

JO - Water Research

JF - Water Research

SN - 0043-1354

ER -

ID: 47450662