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define sensor area

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I am a fresher in Comsol, so I am starting with a simple model (as shown in the image below). I want to do some model with surface reaction in the diffusion model. I have couple of questions>

1. how can i define the sensor area in comsol? I can do the different with rectangle and circle, but I can not do this with line and rectangle.

2. which model i need to choose, does the Nernst-Planck equation requires at least two different solutions?



1 Reply Last Post Apr 19, 2012, 5:58 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago Apr 19, 2012, 5:58 a.m. EDT
Hi

one way is to define a variable as the integeation of operand "1" over the boundary, this applies also to volumes for domains etc.

--
Good luck
Ivar
Hi one way is to define a variable as the integeation of operand "1" over the boundary, this applies also to volumes for domains etc. -- Good luck Ivar

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