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Surface reaction - diffusion: Robin condition

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Hello,

I am working on implementing a reaction-diffusion model. I have a particle in solution, where a reaction is occurring at the surface. I want to implement a Robin condition in the boundary of the particle (so that -D(dCa/dr)|surface = k*(Ca-Ca,b). Here, Ca,b is the concentration of A in the bulk. I am using the modules of "Transport of Diluted Species" and "Surface reactions" but so far, I have only found the option of setting the value of the flux at the particle surface but this is not what I am looking for - I want the flux to be tied to Ca via a rate law (and thus define the reaction rate constant). I am unable to find how to implement the Robin condition, and I would appreciate if somebody can help me out with this. I searched the discussion forum but I haven't found an answer. Thanks for your time.

Maria

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