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Mass Transfer - Forced Convection Boundary Condition

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Andrew Ferguson
Andrew Ferguson 2020년 2월 25일
답변: Ravi Kumar 2020년 2월 25일
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?

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Ravi Kumar
Ravi Kumar 2020년 2월 25일
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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