CFD modeling of unsteady fluid flow and mass transfer in spacer-filled membrane modules

Hasani, S. M. F.; Shakaib, M.; Mahmood, M.

doi:10.5004/dwt.2009.778

Cited by 11 publications

(1 citation statement)

References 14 publications

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“…The attack angle has a significant impact on the flow field through a multilayer spacer positioned between two flat sheet membranes. When the main bulk encounters thick or thin filaments at an attack angle, multilayer spacers can produce various multidirectional flow channeling 59 . As reported by Da Costa et al ., 14 using a spacer at an attack angle expressing greater fluid mixing qualities inevitably leads to 20–37% higher pressure losses, 70–80% form drag development, and 20–30% directional flow change.…”

Section: Multilayered Spacermentioning

confidence: 91%

Multilayered membrane spacer: does it enhance solution mixing?

Al‐Amshawee

Yunus

Dakhil

2023

J of Chemical Tech & Biotech

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The present review systematically investigates and illustrates the effect of multilayered membrane spacers on the features of fluid dynamics that influence all performance metrics. Multilayer spacers are frequently composed of three sets of filaments (i.e., top, middle, and bottom layers), which has the benefit of increasing mass transfer and decreasing membrane surface fouling when compared to ordinary monolayer (e.g., extruded spacer) and two‐layer spacers. The review found that the multilayer spacer's middle layer disperses primary flow to the thin side spacers placed near the membrane's surfaces. The thin side spacers will then form narrow passageways to keep the solution in situ for as long as mass transfer is achievable. The employment of thin spacers close to the membranes at satisfactory operational conditions (e.g., adequate flow velocity) results in swirling flows and incorporation of transverse and longitudinal eddies near to the membranes, reducing the boundary layer's width and making the associated ion concentration domain at the membranes much more consistent. The concept and implementation of multilayer geometry in feed channels appears to be promising, since a multilayered spacer can function at a lower maximum flow velocity than normal two‐layer spacers, saving operational energy while minimizing concentration gradients at the membrane surfaces. Furthermore, the multilayer structure's durability and mechanical strength may help to reduce membrane deformation and maintain long processes. Future studies might look at significantly reducing spacer thickness for industrial uses. © 2023 Society of Chemical Industry (SCI).

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Section: Multilayered Spacermentioning

confidence: 91%