CFD modelling of the hydrodynamics in a filtration unit with rotating membranes

Pinilla, Andrés; Berrío, Juan Carlos; Guerrero, E.T.; Valdés, Juan Pablo; Becerra, Deisy; Pico, Paula; Vargas, L. C.; Madsen, S.; Bentzen, Thomas Ruby; Ratkovich, Nicolás Ríos

doi:10.1016/j.jwpe.2020.101368

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…In this regard, a systematic numerical approach employing computational fluid dynamics (CFD) is widely used in dynamic filtration to obtain the in-depth flow field, the shear stresses, and the solute concentration near the membrane, which are influenced by the disk shape, the disk rotating speed, the operating pressure, etc. [ 28 , 29 , 30 , 31 , 32 ]. The flow in the previous numerical studies belongs to a laminar [ 29 , 30 ] or turbulent flow regime [ 31 , 32 ], depending on the material properties of the feed, the rotating speed of the disk, and the geometrical parameters of a specific dynamic filtration system.…”

Section: Introductionmentioning

confidence: 99%

“…[ 28 , 29 , 30 , 31 , 32 ]. The flow in the previous numerical studies belongs to a laminar [ 29 , 30 ] or turbulent flow regime [ 31 , 32 ], depending on the material properties of the feed, the rotating speed of the disk, and the geometrical parameters of a specific dynamic filtration system. The flow regime is described by dimensionless numbers such as the Reynolds number (Re) and the aspect ratio (

) in a rotating system, which will be discussed in Section 2 .…”

Section: Introductionmentioning

confidence: 99%

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The Effect of the Rotating Disk Geometry on the Flow and Flux Enhancement in a Dynamic Filtration System

2023

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A numerical study was conducted to investigate the effect of rotating patterned disks on the flow and permeate flux in a dynamic filtration (DF) system. The DF system consists of a rotating patterned disk and a stationary housing with a circular flat membrane. The feed flow is driven by the rotating disk with the angular velocity ranging from 200 to 1000 rpm and the applied pressure difference between inlet and outlet ports. Wheel-shaped patterns are engraved on the disk surfaces to add perturbation to the flow field and improve the permeate flux in the filtration system. Five disks with varying numbers of patterns were used in numerical simulations to examine the effects of the number of patterns and the angular velocity of the disk on the flow and permeate flux in the DF system. The flow characteristics are studied using the velocity profiles, the cross-sectional velocity vectors, the vortex structures, and the shear stress distribution. The wheel-shaped patterns shift the central core layer in the circumferential velocity profile towards the membrane, leading to higher shear stresses at the membrane and higher flux compared to a plain disk. When the number of patterns on the disk exceeded eight at a fixed Reynolds number, there were significant increases in wall shear stress and permeate flux compared to a plain disk filtration system with no pattern.

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Section: Introductionmentioning

confidence: 99%

) in a rotating system, which will be discussed in Section 2 .…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Rotating Disk Geometry on the Flow and Flux Enhancement in a Dynamic Filtration System

2023

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“…A follow-up study will describe the membrane surface's fluid dynamic mechanism. The previous reports show that a CFD simulation would visualize the shear stress profile on the membrane surface [44,45].…”

Section: Effect Of Membrane-to-disk Gapmentioning

confidence: 99%

“…The key to overcoming this issue is developing highly thin spacers and placing them very close to the membrane surfaces, as proposed earlier in the vibrating spacer system [14]. Moreover, this system can be further explored for different applications, particularly on challenging and viscous feeds such as anaerobic sludge or hydrolysate filtration [44]. Applying traditional air bubbling would be less effective.…”

Section: Specific Energy Consumption For Fouling Controlmentioning

confidence: 99%

A Rotary Spacer System for Energy-Efficient Membrane Fouling Control in Oil/Water Emulsion Filtration

et al. 2022

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Membrane fouling deteriorates membrane filtration performances. Hence, mitigating membrane fouling is the key factor in sustaining the membrane process, particularly when treating fouling-prone feed, such as oil/water emulsions. The use of spacers has been expanded in the membrane module system, including for membrane fouling control. This study proposed a rotating spacer system to ameliorate membrane fouling issues when treating an oil/water emulsion. The system’s effectiveness was assessed by investigating the effect of rotating speed and membrane-to-disk gap on the hydraulic performance and the energy input and through computational fluid dynamics (CFD) simulation. The results showed that the newly developed rotary spacer system was effective and energy-efficient for fouling control. The CFD simulation results proved that the spacer rotations induced secondary flow near the membrane surface and imposed shear rate and lift force to exert fouling control. Increasing the rotation speed to an average linear velocity of 0.44 m/s increased the permeability from 126.8 ± 2.1 to 175.5 ± 2.7 Lm−2h−1bar−1. The system showed better performance at a lower spacer-to-membrane gap, in which increasing the gap from 0.5 to 2.0 cm lowered the permeability from 175.5 ± 2.7 to 126.7 ± 2.0 Lm−2h−1bar−1. Interestingly, the rotary system showed a low energy input of 1.08 to 4.08 × 10−3 kWhm−3 permeate when run at linear velocities of 0.27 to 0.44 ms−1. Overall, the findings suggest the competitiveness of the rotary spacer system as a method for membrane fouling control.

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“…Particularly for full-scale commercial MBR, where the possibility of making directly observations is highly limited, the CFD (Computational Fluid Dynamics) is a very useful tool [15,16] to explore the hydrodynamics of gas-liquid two-phase flow. There are several multi-phase simulation methods for gas-liquid interface calculations, such as Euler-Euler, mixture and VOF (Volume of Fluid) methods.…”

Section: Introductionmentioning

confidence: 99%

Aeration pipe design for free bubbling hydrodynamic optimization of flat sheet MBRs

Wang

Yan

Fang

et al. 2022

Journal of Membrane Science

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CFD modelling of the hydrodynamics in a filtration unit with rotating membranes

Cited by 8 publications

References 13 publications

The Effect of the Rotating Disk Geometry on the Flow and Flux Enhancement in a Dynamic Filtration System

The Effect of the Rotating Disk Geometry on the Flow and Flux Enhancement in a Dynamic Filtration System

A Rotary Spacer System for Energy-Efficient Membrane Fouling Control in Oil/Water Emulsion Filtration

Aeration pipe design for free bubbling hydrodynamic optimization of flat sheet MBRs

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