Deposition within a porous electrode
I am building a (1D) model of a battery in which an insoluble, insulating product is deposited in the pores of a porous cathode. It uses tertiary currents, with a PDE to give the deposition rate. The...
View ArticleRe: Deposition within a porous electrode
Hi Campbell, Sorry but I do not understand your model. Where does your 1D line go? From a fluid container into a porous electrode? Along a single pore in the electrode? Radially in a single pore? What...
View ArticleRe: Deposition within a porous electrode
The 1D "stack" is the structure of a very simple battery - anode, liquid electrolyte, porous cathode terminating in a cathode current collector. The (ionic) current flows through that stack, with the...
View ArticleRe: Deposition within a porous electrode
So in this porous region your liquid is partially transformed into a solid deposit, and now you want to know to what extent this results in a convective flow of electrolyte through the boundary between...
View ArticleRe: Deposition within a porous electrode
Pieter: Thanks for the help. Your suggestion led me to examine the velocity field more closely. I believe that the Darcy velocity is solving correctly. If I impose BCs of no flow at the anode,...
View ArticleRe: Deposition within a porous electrode
Hi Campbell, So what is reacting? Only your cations, or also the solvent? Have you coupled both the flow and the ion concentrations at the interface between the free and the porous region? Are you...
View ArticleRe: Deposition within a porous electrode
Hi Pieter: A dilute neutral species in the electrolyte is reduced at the cathode, and combines with the cations to form the insoluble deposit. When I model this without reduction of porosity, the...
View ArticleRe: Deposition within a porous electrode
Campbell: As far as I can infer, your 1-D model has a point (A) for the anode (which is grounded) then a "line (A-B)" representing the electrolyte region and then another "line (B-C)" where C is the...
View ArticleRe: Deposition within a porous electrode
Sri: 1. Point A has no flow, point B has no BC (i.e. I am assuming Darcy continuity), point C has constant pressure (1 atm) and an outflow given by the rate of volume decrease. 2. Not quite. The...
View ArticleRe: Deposition within a porous electrode
So the only difference between the case which gives results as expected and the case where you include the decreased porosity is that you have included an outflow at boundary C?
View ArticleRe: Deposition within a porous electrode
The working models had no Darcy node and there was no convective flow in the electrolyte. I added Darcy and set the outflow to the volume loss, coupling the velocity field back to convection in the...
View ArticleDeposition within a porous electrode
I am building a (1D) model of a battery in which an insoluble, insulating product is deposited in the pores of a porous cathode. It uses tertiary currents, with a PDE to give the deposition rate. The...
View ArticleRe: Deposition within a porous electrode
Hi Campbell, Sorry but I do not understand your model. Where does your 1D line go? From a fluid container into a porous electrode? Along a single pore in the electrode? Radially in a single pore? What...
View ArticleRe: Deposition within a porous electrode
The 1D "stack" is the structure of a very simple battery - anode, liquid electrolyte, porous cathode terminating in a cathode current collector. The (ionic) current flows through that stack, with the...
View ArticleRe: Deposition within a porous electrode
So in this porous region your liquid is partially transformed into a solid deposit, and now you want to know to what extent this results in a convective flow of electrolyte through the boundary between...
View ArticleRe: Deposition within a porous electrode
Pieter: Thanks for the help. Your suggestion led me to examine the velocity field more closely. I believe that the Darcy velocity is solving correctly. If I impose BCs of no flow at the anode,...
View ArticleRe: Deposition within a porous electrode
Hi Campbell, So what is reacting? Only your cations, or also the solvent? Have you coupled both the flow and the ion concentrations at the interface between the free and the porous region? Are you...
View ArticleRe: Deposition within a porous electrode
Hi Pieter: A dilute neutral species in the electrolyte is reduced at the cathode, and combines with the cations to form the insoluble deposit. When I model this without reduction of porosity, the...
View ArticleRe: Deposition within a porous electrode
Campbell: As far as I can infer, your 1-D model has a point (A) for the anode (which is grounded) then a "line (A-B)" representing the electrolyte region and then another "line (B-C)" where C is the...
View ArticleRe: Deposition within a porous electrode
Sri: 1. Point A has no flow, point B has no BC (i.e. I am assuming Darcy continuity), point C has constant pressure (1 atm) and an outflow given by the rate of volume decrease. 2. Not quite. The...
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