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Chemial Engineering, Mass Transfer, Diffusion
Posted 23 mars 2013, 23:47 UTC−4 Heat Transfer & Phase Change, Chemical Reaction Engineering, Geometry, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 4.2, Version 4.2a 0 Replies
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S can dissove into the out phase liquid W, while P cannot and stay in the droplet. The droplet surface(S&P-W) is shrinking with time. The problem is a transient one.
The governing equation is Fick's second law. Because of the symmetry, the problem can be describled by a 1 D transient equation.
I set a 1D model with ALE to solve it.The surface moves at a speed of dR/dt. In initial, I encountered minus concentration problem because the sharp concentration gradient near the boundary. Then I found that the Heaviside Function can be apllied to conquer this. However , another problem comes. The concentration should be in the range[0,1], I got jumping profile, wich shows that Cs sometimes higher than 1, which is not the case obviously.
Would you please give me some suggestions?
Appreciation!
Best Regards!
Tsong
Hello Tsong Gau
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