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Sensitivity analysis and gradient-based optimisation of feed spacer shape in reverse osmosis membrane processes using discrete adjoint approach
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Wang, Yang, He, Wei and Müller, Jens-Dominik (2019) Sensitivity analysis and gradient-based optimisation of feed spacer shape in reverse osmosis membrane processes using discrete adjoint approach. Desalination, 449 . pp. 26-40. doi:10.1016/j.desal.2018.09.016
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WRAP-sensitivity-analysis-gradient-optimisation-feed-osmosis-discrete-adjoint-He-2019.pdf - Accepted Version Embargoed item. Restricted access to Repository staff only until 17 October 2020. Contact author directly, specifying your specific needs. - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (3778Kb) |
Official URL: http://dx.doi.org/10.1016/j.desal.2018.09.016
Abstract
Spacers play a significant role in enhancing water permeation in membrane desalination processes but also increase pressure drop and specific energy consumption for freshwater production. The complex coupling of nonlinear channel flow along with mass transfer of water and salts across the membrane makes it challenging to determine an optimal spacer design. Conventional methods employ a design loop based on manual design and re-evaluation, which is time-consuming and typically will only find an improved, but not an optimal design. This paper presents an alternative approach that employs the gradient-based adjoint method to explore an optimal design in complex shapes with many design parameters. The novel design methodology provides an effective tool for designers to pursue advanced spacer designs. To elucidate the design method with sensitivities, the spacer in cavity, submerged and zigzag configurations are first analysed with the computed gradients of pressure loss and flow permeation with respect to the displacement of the grid nodes on spacer surface. Then, an optimisation case of cylinder spacers in the zigzag configuration finds an optimal spacer that has 24% pressure loss reduction and only 0.43% permeation drop as compared to a standard cylinder spacer, indicating the new method's potential in finding high-performance spacer designs.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering | ||||||||
| Divisions: | Faculty of Science > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Saline water conversion -- Reverse osmosis proces, Water-supply, Membranes (Technology) -- Research | ||||||||
| Journal or Publication Title: | Desalination | ||||||||
| Publisher: | Elsevier BV | ||||||||
| ISSN: | 0011-9164 | ||||||||
| Official Date: | 1 January 2019 | ||||||||
| Dates: |
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| Date of first compliant deposit: | 12 February 2020 | ||||||||
| Volume: | 449 | ||||||||
| Page Range: | pp. 26-40 | ||||||||
| DOI: | 10.1016/j.desal.2018.09.016 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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