Analytical and Numerical Modelling of Newtonian and non-Newtonian Liquid in a Rotational Cross-flow MBR

Thomas Ruby Bentzen, Nicolas Rios Ratkovich, S. Madsen, J. C. Jensen, S. N. Bak, Michael R. Rasmussen

Research output: Contribution to journalJournal articleResearchpeer-review

11 Citations (Scopus)

Abstract

Fouling is the main bottleneck of the widespread use of MBR systems. One way to decrease and/or control fouling is by process hydrodynamics. This can be achieved by the increase of liquid cross- flow velocity. In rotational cross-flow MBR systems, this is attained by the spinning of, for example, impellers. Validation of the CFD (computational fluid dynamics) model was made against laser Doppler anemometry (LDA) tangential velocity measurements (error less than 8%) using water as a fluid. The shear stress over the membrane surface was inferred from the CFD simulations for water. However, activated sludge (AS) is a non-Newtonian liquid, for which the CFD model was modified incorporating the non-Newtonian behaviour of AS. Shear stress and area-weighted average shear stress relationships were made giving error less that 8% compared with the CFD results. An empirical relationship for the area-weighted average shear stress was developed for water and AS as a function of the angular velocity and the total suspended solids concentration. These relationships can be linked to the energy consumption of this type of systems.
Original languageEnglish
JournalWater Science and Technology
Volume66
Issue number11
Pages (from-to)2318–2327
Number of pages10
ISSN0273-1223
DOIs
Publication statusPublished - 2012

Fingerprint

Non Newtonian liquids
shear stress
Shear stress
Computational fluid dynamics
activated sludge
liquid
Fouling
fouling
modeling
Water
Impellers
Angular velocity
Measurement errors
Velocity measurement
water
Dynamic models
Energy utilization
Hydrodynamics
laser
hydrodynamics

Keywords

  • CFD
  • Non-Newtonian
  • Rotating Cross-Flow MBR
  • Shear Stress

Cite this

Bentzen, Thomas Ruby ; Ratkovich, Nicolas Rios ; Madsen, S. ; Jensen, J. C. ; Bak, S. N. ; Rasmussen, Michael R. / Analytical and Numerical Modelling of Newtonian and non-Newtonian Liquid in a Rotational Cross-flow MBR. In: Water Science and Technology. 2012 ; Vol. 66, No. 11. pp. 2318–2327.
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abstract = "Fouling is the main bottleneck of the widespread use of MBR systems. One way to decrease and/or control fouling is by process hydrodynamics. This can be achieved by the increase of liquid cross- flow velocity. In rotational cross-flow MBR systems, this is attained by the spinning of, for example, impellers. Validation of the CFD (computational fluid dynamics) model was made against laser Doppler anemometry (LDA) tangential velocity measurements (error less than 8{\%}) using water as a fluid. The shear stress over the membrane surface was inferred from the CFD simulations for water. However, activated sludge (AS) is a non-Newtonian liquid, for which the CFD model was modified incorporating the non-Newtonian behaviour of AS. Shear stress and area-weighted average shear stress relationships were made giving error less that 8{\%} compared with the CFD results. An empirical relationship for the area-weighted average shear stress was developed for water and AS as a function of the angular velocity and the total suspended solids concentration. These relationships can be linked to the energy consumption of this type of systems.",
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Analytical and Numerical Modelling of Newtonian and non-Newtonian Liquid in a Rotational Cross-flow MBR. / Bentzen, Thomas Ruby; Ratkovich, Nicolas Rios; Madsen, S.; Jensen, J. C.; Bak, S. N.; Rasmussen, Michael R.

In: Water Science and Technology, Vol. 66, No. 11, 2012, p. 2318–2327.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Bentzen, Thomas Ruby

AU - Ratkovich, Nicolas Rios

AU - Madsen, S.

AU - Jensen, J. C.

AU - Bak, S. N.

AU - Rasmussen, Michael R.

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