Interpretation of Tlmbq parameters, fitting L

[ancarnevali]

Hi!
Regarding the Tlmbq model, I see that its Z is expressed as a function of Y and n in this package, while in the cited work by Bisquert such values are not present. I was wondering, how can one physically interpret Y and n, perhaps linking them directly to the parameters of the paper (DOI:10.1039/B001708F)?

Moreover, what is the reason for keeping the L parameter fixed? How could one extract the average length of the pores from a fit, in order to get the average path tortuosity?

[vyrjana]

Hi. Y in this case is equal to Q in that paper. You can see various notations used for the same parameter in different sources for constant phase elements (Y or Q0 or just Q, n or alpha). I tend to use Y and n.

If I remember correctly, L is 1 m and fixed by default because it seemed to be a convention adopted by some other software. The examples in the paper also seem to always assume L = 1. However, you are able to set that parameter to be variable instead of fixed.