Impact of non-Newtonian fluid behavior on hydrodynamics and mass transfer in spacer-filled channels

Fischer, N.; Masoudian, Mohsen S.; Germann, Natalie

doi:10.1088/1873-7005/abb91e

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…Compared to CTMs and HFMs, SWMs offer the highest packing density, i.e., active membrane area per module, and thus the highest whey protein mass flow per module [ 28 ]. On the contrary, SWMs suffer from flow shadows behind spacer filaments [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] and, therefore, limited cleanability [ 29 ] and mechanical stability. In SWMs, the membrane permeate pockets are formed by glueing together individual membrane sheets, which are then wrapped around a central permeate collection tube and fixed by an outer hull.…”

Section: Introductionmentioning

confidence: 99%

Increasing Performance of Spiral-Wound Modules (SWMs) by Improving Stability against Axial Pressure Drop and Utilising Pulsed Flow

Kürzl,

Hartinger,

Ong

et al. 2023

Membranes

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Spacer-induced flow shadows and limited mechanical stability due to module construction and geometry are the main obstacles to improving the filtration performance and cleanability of microfiltration spiral-wound membranes (SWMs), applied to milk protein fractionation in this study. The goal of this study was first to improve filtration performance and cleanability by utilising pulsed flow in a modified pilot-scale filtration plant. The second goal was to enhance membrane stability against module deformation by flow-induced friction in the axial direction (“membrane telescoping”). This was accomplished by stabilising membrane layers, including spacers, at the membrane inlet by glue connections. Pulsed flow characteristics similar to those reported in previous lab-scale studies could be achieved by establishing an on/off bypass around the membrane module, thus enabling a high-frequency flow variation. Pulsed flow significantly increased filtration performance (target protein mass flow into the permeate increased by 26%) and cleaning success (protein removal increased by 28%). Furthermore, adding feed-side glue connections increased the mechanical membrane stability in terms of allowed volume throughput by ≥100% compared to unmodified modules, thus allowing operation with higher axial pressure drops, flow velocities and pulsation amplitudes.

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