Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Rotating disk electrode
Posted Oct 2, 2017, 7:09 a.m. EDT Chemical, Computational Fluid Dynamics (CFD), Electrochemistry Version 5.3 0 Replies
Please login with a confirmed email address before reporting spam
Hi
Some improvement has taken place in my simulations of a RDE (attached). The problems are that ca. 150 rpm is the highest rotation speed that a simulation converges with, and the limiting current does not follow the square root dependence of the angular velocity: the exponent is more like 0.825.
My exact question is that should I have No Flux condition on all boundaries, except the electrode surface, of course? On the first hand, using that the simulation does not converge and, on the other hand, there must be a bulk concentration BC in order not to loose material from the simulation domain; that would correspond to bulk electrolysis.
Simulations to a channel flow electrode or a wall-jet electrode neither give the proper flow rate dependence of the limiting current.
Can someone comment?
Lasse
Attachments:
Hello Lasse Murtomäki
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.