The configuration and application of helical membrane modules in MBR

Liang, Jie; Liu, Lifen; Yang, Fenglin; Liu, Fengxia; Liu, Zhijun

doi:10.1016/j.memsci.2011.12.011

Cited by 25 publications

(9 citation statements)

References 24 publications

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“…The flow-profile of the fluid can also be influenced by macroscopic deformation of the membrane and as a result, curled, twisted and hollow-fibers with complex shapes have been studied and found to enhance mass transfer. [20][21][22][23][24][25][26][27] Such geometries promote mixing and transport phenomena via secondary flows or dean vortices. Innovative fabrication techniques afford non-circular hollow-fiber membranes with topological features on the in-and outside of the membrane.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the structure dependent performance of 3-D rapid prototyped membranes

Femmer

Kuehne

Weßling

2015

Chemical Engineering Journal

118

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Section: Introductionmentioning

confidence: 99%

Estimation of the structure dependent performance of 3-D rapid prototyped membranes

Femmer

Kuehne

Weßling

2015

Chemical Engineering Journal

118

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“…Kaufhold, D. a [12] applied Dean vortices to improve the fluid transfer rate and researched how the flow rate affects mass transfer. Jie, L. [13] used the PIV technique to demonstrate the difference in intensity and distribution of the flow field/speed vector between the spiral membrane module and the flat one. The author showed that the spiral membrane produces a swirling flow near the membrane surface, increasing the shear rate/flow rate.…”

Section: Introductionmentioning

confidence: 99%

The Research of the Flow Characteristics in Spiral Membrane Separator

Xiantao¹

2019

AJWSE

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The spiral membrane separator is a novel module proposed for reducing the concentration polarization and membrane fouling of membrane separation process. This membrane separation process benefits from dean vortices produced by centrifugal instability in enhancing fluid mass transfer. A numerical stimulation of this membrane separation is presented and used to analyze the fluid flow characteristics and thoroughly understand the separation mechanism. The numerical model consists of a spiral flow path with rectangular sector. As the simulation with infiltration, the fluid domain of the ceramic membrane tube was as a porous medium domain. The standard momentum equation, added with the momentum equation source term which composed of the viscosity loss term and the inertia loss term, are figured out through the experimental characterization. In the simulation of spiral membrane separation, the Dean secondary flow structure is identified and found to enhance fluid mass transfer and to increase the permeate flux. The critical unstable state of spiral membrane separation is accordingly De=246 without the flow permeation and De=863 with the permeation, where Dean vortices cause collisions and the mixing of fluid particles. Then in the case of permeation, the fluid in separator at De=1232 is numerically simulated to show that the higher flow velocity and a large fluctuating trend of wall shear stress near the membrane surface (inside), which mainly contributed to alleviate concentration polarization and membrane fouling.

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“…Rotating membrane discs (SpinTek) [5] have demonstrated dewatering from 5% to 15% during an endurance test of over 1500 h. Stationary membranes with rotating discs/impellers: DYNO; BOKELA; OPTIFILTER exist to enhance the shear at, or near to, the membrane surface. Other designs include: overlapping rotational membranes [6,7], overlapped counterrotational membranes/impellers [8], helical rotating membranes [9][10][11], magnetically induced membrane vibrations [12], and axially oscillated hollow tube filters in membrane bio-reactors [13]. Filter designs that involve a moving membrane, or surface near to it, are more complex than simple crossflow systems, but they may provide a practical alternative to crossflow if they can sustain an appreciable flux and if they are less damaging to the material to be filtered.…”

Section: Introductionmentioning

confidence: 99%