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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20400 - Chemical engineering

Projekt

<a href="/cs/project/GA25-18111S" target="_blank" >GA25-18111S: Transportní procesy na iontově-výměnných membránách vyvolané elektrickým a gravitačním polem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

INDUSTRIAL &amp; ENGINEERING CHEMISTRY RESEARCH

ISSN

0888-5885

e-ISSN

1520-5045

Svazek periodika

Neuveden

Číslo periodika v rámci svazku

23.07.2025

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

nestránkováno

Kód UT WoS článku

001534200500001

EID výsledku v databázi Scopus

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