Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)

A study has been made of mass transport in electrolytic cells with vertical electrodes separated by a small distance. At the cathode, ferricyanide was reduced to ferrocyanide; at the anode, ferrocyanide was oxidized to ferricyanide. The mass transport rate was determined by measuring the steady-stat...

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Autores principales: Böhm, U., Ibl, N.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00134686_v13_n4_p891_Bohm
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00134686_v13_n4_p891_Bohm2023-10-03T14:10:48Z Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode) Böhm, U. Ibl, N. A study has been made of mass transport in electrolytic cells with vertical electrodes separated by a small distance. At the cathode, ferricyanide was reduced to ferrocyanide; at the anode, ferrocyanide was oxidized to ferricyanide. The mass transport rate was determined by measuring the steady-state limiting current ig. Under the conditions of our experiments ig was approximately inversely proportional to the distance a between the electrodes when a was smaller than about 0·4-0·6 mm. This corresponds to the theoretical relationship for mass transport without convection. At electrode distances larger than about 0·4-0·6 mm, natural convection becomes effective and the limiting current soon becomes virtually independent of a, as it is the case for the well investigated fully developed natural convection at a vertical plate where there is no interference by a counter-wall. The transition between the two transport regimes takes place mainly within a rather narrow range of a. The values of a at which the bending of the log ig/log a lines occurs depend on the electrode height and on the concentration of the reacting species. In addition, there is a broader transition region (a between 1 and 6 mm) where natural convection is unstable and fluctuations of the current with time are observed. © 1968. Fil:Böhm, U. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00134686_v13_n4_p891_Bohm
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A study has been made of mass transport in electrolytic cells with vertical electrodes separated by a small distance. At the cathode, ferricyanide was reduced to ferrocyanide; at the anode, ferrocyanide was oxidized to ferricyanide. The mass transport rate was determined by measuring the steady-state limiting current ig. Under the conditions of our experiments ig was approximately inversely proportional to the distance a between the electrodes when a was smaller than about 0·4-0·6 mm. This corresponds to the theoretical relationship for mass transport without convection. At electrode distances larger than about 0·4-0·6 mm, natural convection becomes effective and the limiting current soon becomes virtually independent of a, as it is the case for the well investigated fully developed natural convection at a vertical plate where there is no interference by a counter-wall. The transition between the two transport regimes takes place mainly within a rather narrow range of a. The values of a at which the bending of the log ig/log a lines occurs depend on the electrode height and on the concentration of the reacting species. In addition, there is a broader transition region (a between 1 and 6 mm) where natural convection is unstable and fluctuations of the current with time are observed. © 1968.
format JOUR
author Böhm, U.
Ibl, N.
spellingShingle Böhm, U.
Ibl, N.
Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
author_facet Böhm, U.
Ibl, N.
author_sort Böhm, U.
title Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
title_short Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
title_full Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
title_fullStr Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
title_full_unstemmed Ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
title_sort ueber das abklingen der natürlichen konvektion bei der elektrolyse in engen räumen (system elektrode-elektrode)
url http://hdl.handle.net/20.500.12110/paper_00134686_v13_n4_p891_Bohm
work_keys_str_mv AT bohmu ueberdasabklingendernaturlichenkonvektionbeiderelektrolyseinengenraumensystemelektrodeelektrode
AT ibln ueberdasabklingendernaturlichenkonvektionbeiderelektrolyseinengenraumensystemelektrodeelektrode
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