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Распределение концентраций в диффузионном слое при электродиализе в условиях запредельного режима

Распределение концентраций в диффузионном слое при электродиализе в условиях запредельного режима

Abstract

Einkomponentenlösungen in den Bedingungen der idealselektiven Kationenaustauschmembran der Elektrodialyse gemäß ist die zahlenmäßige Lösung der Aufgabe der Formierung der Ionenströme in der Diffusionsgrenzeschicht erhalten. Die Lösung wurde auf Grund der Gleichungen von Nernst-Planсk bei dem nichtlinearen Charakter der Veränderung der Konzentrationen mit der Teilnahme der Erzeugnissen der Wasserdissaziation der Wasserstoffund Hydroxylionen formuliert. Bei der Elektrodialyse im Überlastungsregim sind die Abhängigkeiten der Übertragungszahlen für die in der Massenübertragung teilnehmenden Ionen von der Stromdichte und die Veränderung der Lokalzahlen der Übertragung nach der Stärke der Diffusionsschicht erhalten.Pour les solutions à un composant dans les conditions dune membrane sélective idéale de léchange de cation appliquée à lélectrolyse est obtenue une solution numérique du problème de la formation des courants des ions dans une couche diffusive limitée formulée à la base des équations de Nernst-Planck du caractère non-linéaire du changement des concentrations avec la participation des produits de la dissociation de leau des ions de lhydrogène et de lhydroxyle. Lors de lélectrodialyse dans le régime au dessus des limites sont obtenues les dépendances des nombres du transfert pour les ions participant au transfert de masse de la densité du courant ainsi de le changement des nombres locaux du transfert de masse sur lépaisseur dune couche diffusive.For single-component solutions in conditions of perfectly selective cation-exchange membrane in relation to electrodialysis we obtained numerical solution to the problem of formation of ion fluxes in the diffusion boundary layer formulated on the basis of Nernst-Planck equations under nonlinear character of concentration change with dissociation products of water hydrogen and hydroxyl ions. In the overlimiting mode of electrodialysis we obtained the dependences of transfer numbers for ions, involved in mass transfer, on the current density and changes in local transfer numbers by the thickness of the diffusion layer.

Для однокомпонентных растворов в условиях идеально селективной катионообменной мембраны применительно к электродиализу получено численное решение задачи формирования потоков ионов в диффузионном пограничном слое, сформулированное на основе уравнений Нернста-Планка при нелинейном характере изменения концентраций с участием продуктов диссоциации воды ионов водорода и гидроксила. При электродиализе в запредельном режиме получены зависимости чисел переноса для ионов, участвующих в массопереносе, от плотности тока и изменения локальных чисел переноса по толщине диффузионного слоя.Für die

Keywords

ДИССОЦИАЦИЯ ВОДЫ, ДИФФУЗИОННЫЙ СЛОЙ, ЗАПРЕДЕЛЬНЫЙ РЕЖИМ, КОНЦЕНТРАЦИОННАЯ ПОЛЯРИЗАЦИЯ, ПРЕДЕЛЬНЫЙ ТОК, ЧИСЛА ПЕРЕНОСА

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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