Mass Transfer - Forced Convection Boundary Condition

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Andrew Ferguson
Andrew Ferguson el 25 de Feb. de 2020
Respondida: Ravi Kumar el 25 de Feb. de 2020
I am trying to apply a forced convection boundary conditon to a time-dependent PDE. The BC I want to apply is:
The mass transfer coefficient, density, diffusion coefficient, and Xa are all assumed to be constant. What is the best way to go about doing this?
I set up a Neumann BC with
I was able to get a solution but wasn't sure if I set this up appropiately.
I also tried to set up a Dirichlet BC with
applyBoundaryCondition(model,'dirichlet','Edge',4,'r',@fun1,'h',1);
function BC = fun1(~,state)
kc = 0.0021;
Xa = 3*10^-6;
rho_s = 1500;
Ds = 4.1*10^-4;
BC = Xa - (rho_s*Ds/kc).*state.uy;
end
but I wasn't able to get a solution. Does anyone have any comments if either of these approaches are appropiate or, if not, how should I approach this probelm?

Respuesta aceptada

Ravi Kumar
Ravi Kumar el 25 de Feb. de 2020
Your Neumann BC approach is the right option. But be aware that you can only model mass diffusion within domain, forced convection at the boundary is fine.
Regards,
Ravu

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