3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow

Multi-layer feed channel spacers have shown superior mass transfer enhancement than conventional dual-layer spacers used in reverse osmosis (RO) spiral wound membrane modules. However, mass transfer indicators do not directly address the economic advantages of multi-layer spacers. To allow for a dir...

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Main Authors:	Liang, Y. Y., K. Y., Toh, Weihs, G. A. Fimbres
Format:	Article
Language:	English
Published:	Elsevier Ltd 2019
Subjects:	QD Chemistry TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/1/3D%20CFD%20study%20of%20the%20effect%20of%20multi-layer.pdf

id	ump-24695
recordtype	eprints
spelling	ump-246952019-12-31T01:50:02Z http://umpir.ump.edu.my/id/eprint/24695/ 3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow Liang, Y. Y. K. Y., Toh Weihs, G. A. Fimbres QD Chemistry TP Chemical technology Multi-layer feed channel spacers have shown superior mass transfer enhancement than conventional dual-layer spacers used in reverse osmosis (RO) spiral wound membrane modules. However, mass transfer indicators do not directly address the economic advantages of multi-layer spacers. To allow for a direct economic comparison of spacer designs, a simplified multi-scale techno-economic model is proposed which can provide useful cost trends. A total of 8 feed spacer geometries with different attack angles (α = 0–60°) and filament sizes (df/hch = 0.4–0.6) are first investigated using 3D-CFD. Multi-layer spacers typically increase both Sherwood number (~12%) and friction factor (~140%). The techno-economic model is then used to assess the impact of these changes on the total processing cost for RO. The latter analysis found that larger pressure drops associated with multi-layer spacers in long channels have little impact on total water processing cost for RO, with multi-layer spacers showing lower total processing costs (by 2–4%) than the dual-layer spacer for both seawater and brackish water RO. Novel spacer designs should therefore emphasise flux enhancement. The importance of including energy recovery for a more accurate economic analysis is highlighted, especially for systems with low recovery ratio. Elsevier Ltd 2019-06-15 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/24695/1/3D%20CFD%20study%20of%20the%20effect%20of%20multi-layer.pdf Liang, Y. Y. and K. Y., Toh and Weihs, G. A. Fimbres (2019) 3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow. Journal of Membrane Science, 580. pp. 256-267. ISSN 0376-7388 https://doi.org/10.1016/j.memsci.2019.02.015 https://doi.org/10.1016/j.memsci.2019.02.015
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	QD Chemistry TP Chemical technology
spellingShingle	QD Chemistry TP Chemical technology Liang, Y. Y. K. Y., Toh Weihs, G. A. Fimbres 3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
description	Multi-layer feed channel spacers have shown superior mass transfer enhancement than conventional dual-layer spacers used in reverse osmosis (RO) spiral wound membrane modules. However, mass transfer indicators do not directly address the economic advantages of multi-layer spacers. To allow for a direct economic comparison of spacer designs, a simplified multi-scale techno-economic model is proposed which can provide useful cost trends. A total of 8 feed spacer geometries with different attack angles (α = 0–60°) and filament sizes (df/hch = 0.4–0.6) are first investigated using 3D-CFD. Multi-layer spacers typically increase both Sherwood number (~12%) and friction factor (~140%). The techno-economic model is then used to assess the impact of these changes on the total processing cost for RO. The latter analysis found that larger pressure drops associated with multi-layer spacers in long channels have little impact on total water processing cost for RO, with multi-layer spacers showing lower total processing costs (by 2–4%) than the dual-layer spacer for both seawater and brackish water RO. Novel spacer designs should therefore emphasise flux enhancement. The importance of including energy recovery for a more accurate economic analysis is highlighted, especially for systems with low recovery ratio.
format	Article
author	Liang, Y. Y. K. Y., Toh Weihs, G. A. Fimbres
author_facet	Liang, Y. Y. K. Y., Toh Weihs, G. A. Fimbres
author_sort	Liang, Y. Y.
title	3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
title_short	3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
title_full	3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
title_fullStr	3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
title_full_unstemmed	3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow
title_sort	3d cfd study of the effect of multi-layer spacers on membrane performance under steady flow
publisher	Elsevier Ltd
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/ http://umpir.ump.edu.my/id/eprint/24695/1/3D%20CFD%20study%20of%20the%20effect%20of%20multi-layer.pdf
first_indexed	2023-09-18T22:37:32Z
last_indexed	2023-09-18T22:37:32Z
_version_	1777416695592255488

3D CFD study of the effect of multi-layer spacers on membrane performance under steady flow

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