Polarizing Current Controls the Intensity of Gravitational Convection at Ion-Exchange Membranes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F25%3A43932096" target="_blank" >RIV/60461373:22340/25:43932096 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/full/10.1021/acs.iecr.5c00144" target="_blank" >https://pubs.acs.org/doi/full/10.1021/acs.iecr.5c00144</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.iecr.5c00144" target="_blank" >10.1021/acs.iecr.5c00144</a>

Result language
angličtina
Original language name
Polarizing Current Controls the Intensity of Gravitational Convection at Ion-Exchange Membranes
Original language description
Concentration polarization of ion-exchange membranes in electrodialysis units limits operational current densities to the underlimiting regime, preventing process intensification by simply increasing the electrical input. Reducing the concentration polarization is theoretically achievable through intrinsic transport mechanisms. Although gravitational convection is known to occur on polarized membranes, minimal effort has been devoted to assessing its potential contribution. To begin such an evaluation, we investigate the relationship between gravitational convection intensity and governing factors such as salt concentration and polarizing current. Using electrochemical and microscopic techniques, we study the onset and properties of gravitational convection and its relation to electroconvection. Experimental results are supported by a mathematical model describing system behavior in the underlimiting regime. Flow quantification shows that while bulk salt concentration affects convection intensity, the primary driver is the applied current, which creates density gradients at the membrane. With velocities of hundreds of micrometers per second, gravitational convection appears to be promising for novel electrodialysis designs.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20400 - Chemical engineering

Project
<a href="/en/project/GA25-18111S" target="_blank" >GA25-18111S: Transport processes on ion-exchange membranes induced by electric and gravitational fields</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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