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Homework answers / question archive / Turn in 1 excel with 3 sheets and explanatory text 1

Turn in 1 excel with 3 sheets and explanatory text

1. Modify the demo 1 for diffusion and implement the aging of the diffusion constant. This means the D = D_{0}(1-e^{-t/}^{t}). Make time constant large, slow aging. Study the concentration as function of time in cell 2.

2. Modify the demo 1 for diffusion and, let the outside concentration C0 = 50(1 + cos (pt/10). Make time long enough to create 5 full wave and select diffusion rate slow enough to prevent saturation before 3 waves.

3. Modify the demo 1 so that the diffusion constant D depends on the actual concentration. Modell such that D=0,2 for C< 40 and D=0,7 for C > 40. This is called 2 stage diffusion, typical for wood who’s real cells swell as they absorb water