See Transport and Adsorption (Application Library path COMSOL_Multiphysics/Chemical_Engineering/transport_and_adsorption) to learn how to use a General Form Boundary PDE interface to model a thin adsorption layer with diffusion as a PDE on the boundary of a convection-diffusion problem.
See Rock Fracture Flow (Application Library path COMSOL_Multiphysics/Geophysics/rock_fracture_flow) to learn how to use a Coefficient Form Boundary PDE interface to solve the Reynolds equation on a boundary in a 3D model.
See Shell Diffusion in a Tank (Application Library path COMSOL_Multiphysics/Equation_Based/shell_diffusion) for an example of tangential derivative variables.
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