A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

Koutsou, C.P.; Karabelas, A.J.

doi:10.1016/j.memsci.2015.03.064

Cited by 59 publications

(60 citation statements)

References 36 publications

(108 reference statements)

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“…In most papers dealing with heat or mass transfer in spacer-filled channels [9,11,12,13], the average transfer coefficient is simply defined as the area average…”

Section: Average Coefficientsmentioning

confidence: 99%

Influence of the boundary conditions on heat and mass transfer in spacer-filled channels

Ciofalo

Cerva

Liberto

et al. 2017

J. Phys.: Conf. Ser.

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“…In most papers dealing with heat or mass transfer in spacer-filled channels [9,11,12,13], the average transfer coefficient is simply defined as the area average…”

Section: Average Coefficientsmentioning

confidence: 99%

Influence of the boundary conditions on heat and mass transfer in spacer-filled channels

Ciofalo

Cerva

Liberto

et al. 2017

J. Phys.: Conf. Ser.

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“…Significant work along these lines has been reported (focusing on small or intermediate spatial scales) aiming to understand the effect of spacer characteristics on flow and mass transfer (e.g., [12][13][14]) in order to optimize the feed-spacer geometry (e.g., [15][16][17]) and to study fouling, including bio-fouling (e.g., [18,19]) phenomena. These detailed studies of the flow field in the spacer-filled channels, focusing on a "unit cell" formed by the net-type spacers (also considering periodicity), have proven to be quite fruitful; in addition to improved basic understanding, they have yielded correlations of pressure drop and mass transfer applicable at "unit cell" scale [20,21].…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamics and Mass Transfer in Spacer-Filled Membrane Channels: Effect of Uniform Channel-Gap Reduction Due to Fouling

Koutsou

Karabelas

Kostoglou

2018

Fluids

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Abstract:The time-varying flow field in spacer-filled channels of spiral-wound membrane (SWM) modules is mainly due to the development of fouling layers on the membranes that modify the channel geometry. The present study is part of an approach to tackling this extremely difficult dynamic problem at a small spatial scale, by uncoupling the fluid dynamics and mass transfer from the fouling-layer growth process. Therefore, fluid dynamics and mass transfer are studied for a spacer-filled channel whose geometry is altered by a uniform deposit thickness h. For this purpose, 3D direct numerical simulations are performed employing the "unit cell" approach with periodic boundary conditions. Specific thickness values are considered in the range 2.5-10% of the spacer-filament diameter D as well as other conditions of practical significance. The qualitative characteristics of the altered flow field are found to be very similar to those of the reference geometry with no gap reduction. For a given flow rate, the pressure drop, time-average wall-shear stresses and mass-transfer coefficients significantly increase with increasing thickness h due to reduced channel-gap, as expected. Correlations are obtained, applicable at the "unit cell" scale, of the friction factor f and Sherwood number Sh, which exhibit similar functional dependence of f and Sh on the Reynolds and Schmidt numbers as in the reference no-fouling case. In these correlations the effect of channel-gap reduction is incorporated, permitting predictions in the studied range of fouling-layer thickness (h/D) = 0-0.10. The usefulness of the new results and correlations is discussed in the context of ongoing research toward improved modeling and dynamic simulation of SWM-module operation.

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“…Koutsou et al [17] developed a novel spacer geometry consisting of spheres of diameter equal to the channel height H connected by cylindrical segments of diameter H/2. They considered the periodic unit cell formed by four neighbouring spherical nodes and connecting segments and performed DNS using Fluent™.…”

Section: Review Of the Literaturementioning

confidence: 99%

“…• Re(6) = uvoiddf/ν [15][16][17] • Re(7) = um2H/ν [5] In particular, in a spacer with overlapped filaments of diameter df, distance between the filaments l and channel height H=2df, one has…”

Section: Scales For the Reynolds Numbermentioning

confidence: 99%

On some issues in the computational modelling of spacer-filled channels for membrane distillation

et al. 2017

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This study addresses issues which arise in the computational and experimental modelling of flow and heat / mass transfer in membrane distillation and other processes adopting spacer-filled channels the combined effects of the main parameters that characterize the process (notably spacer pitch to channel height ratio l/H, flow attack angle γ and Reynolds number Re) and the applicability of simple correlations; the influence of the spacer's thermal conductivity. In regard to the complex influence of the parameters, Re, l/H and γ were found to interact heavily, making a separate-effect analysis impossible and power-law friction or heat / mass transfer correlations of little use. Thermal conduction in the spacer, even for low-conductivity polymeric spacers (λ≈0.15 Wm -1 K -1 ), was found to be responsible for up to 10% of the total heat transfer;

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A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

Cited by 59 publications

References 36 publications

Influence of the boundary conditions on heat and mass transfer in spacer-filled channels

Influence of the boundary conditions on heat and mass transfer in spacer-filled channels

Fluid Dynamics and Mass Transfer in Spacer-Filled Membrane Channels: Effect of Uniform Channel-Gap Reduction Due to Fouling

On some issues in the computational modelling of spacer-filled channels for membrane distillation

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