I want to know if there is a possibility, what are the boundary conditions along the x and y axes for the diffusion of RH molecules in a sensitive layer?.
Fick's law of diffusion states that the mass flux of an element per unit area is proportional to concentration gradient. This law relates to diffusion mass transfer and this gives diffusion rate.
Thank you for the message, but my problem is to make a 2D mathematical model based on Fick's law showing the evolution of the absorption kinetics of water molecules (RH%) in a sensitive layer of the sensor humidity according to the model presented in the following work.
Noubeil Guermat, ‘‘Elaboration and Modeling of Water Molecule Sensitive Layers Deposited From Hexamethyldisiloxane’’, Advanced Structured Materials, Vol. 33, (2017), pp. 315-324, doi:10.1007/978-981-10-1602-8_26.