Prediction of diffusion and migration from multilayer polymer packaging into food

AKTS-SML Diffusion Help

1. About the program
2. The mathematical model
3. Concentration distributions in the layers
	> 3.1. Generalized mass balance over a layer volume element > 3.2. Discretization of the layer domain > 3.3. Programming
4. Program instructions
5. Examples
6. Conditions of use
7. SML - License agreement

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3. CONCENTRATION DISTRIBUTION IN THE LAYERS

3.3. PROGRAMMING

Using the boundary conditions expressed by eqs. 3.13-14 and eqs. 3.11-3.12 which describe the diffusion in the bulk, the concentration distribution inside all layers can be computed by Finite Element Analysis for both migrant and the simulant. The initial concentrations of the migrant (in mg/kg units) have to be introduced for all layers at t=0. The strong internal gradients will be calculated very precisely due to the variable step lengths (Fig. 3.2).