Data underlying research for A study on electrokinetic effects of spacers in ED using a segmented electrode stack

doi:10.4121/e54a1b44-0a39-4c23-bc68-656a893bf613.v1
The doi above is for this specific version of this dataset, which is currently the latest. Newer versions may be published in the future. For a link that will always point to the latest version, please use
doi: 10.4121/e54a1b44-0a39-4c23-bc68-656a893bf613
Datacite citation style:
Lammertink, Rob; Paul, Arputha; Jeffery A. Wood (2023): Data underlying research for A study on electrokinetic effects of spacers in ED using a segmented electrode stack. Version 1. 4TU.ResearchData. dataset. https://doi.org/10.4121/e54a1b44-0a39-4c23-bc68-656a893bf613.v1
Other citation styles (APA, Harvard, MLA, Vancouver, Chicago, IEEE) available at Datacite
Dataset
University of Twente logo
usage stats
175
views
3404
downloads
licence
cc-0.png logo CC0

The boundary layer thickness within the fluid channels strongly determines the performance of electrodialysis (ED) processes since it controls the rate of ion transport. Reducing the boundary layer thickness through more efficient mixing allows for reducing the energy input to achieve the same current or higher currents for the same driving potential. In our previous work, we studied the electrokinetic effects of spacers within a lab-scale ED stack by using polyelectrolyte coated spacers that create an electro-osmotic mixing effect that affects the boundary layer near the limiting current regime. In this work, we use a segmented electrode stack to explore how spacer-induced electrokinetic effects impact the evolution of the boundary layer along the length of a stack operating under constant driving potential. By using the segmented electrode system, we are able to show clear differences in the distribution of current (densities) along the stack length between the case with polyelectrolyte-coated spacers and non-coated spacers. Our results show that the use of surface-charged spacers in particular leads to higher current densities in highly ion-depleted regions of the stack (i.e. farther towards the stack outflow) and we attribute this current density increase to increased electro-osmotic mixing within the boundary layer. Additionally, we quantify the difference in spacer performance between the uncoated and coated case using a simple empirical formulation for current density distribution along the stack length.

history
  • 2023-09-08 first online, published, posted
publisher
4TU.ResearchData
format
.m, .xlsx, .jpg
organizations
University of Twente, Department Soft matter, Fluidics and Interfaces

DATA

files (141)