Hello,

I am looking into the spatial distribution of particles with different properties and their effect on adsorption columns.

For this I am using variations of size and porosity and their respective axial distribution inside the column.

My question is how npartype and the matrix for volume fractions are build.

Example:

```
model.root.input.model.unit_001.par_porosity = [0.33,0.5] # -
model.root.input.model.unit_001.par_radius = [1e-6, 2e-6, 3e-6] # m
model.root.input.model.unit_001.npartype = 6
```

In the documentation under “Ordering of multi dimensional data” the example given is

comp0bnd0, comp0bnd1, comp0bnd2, comp1bnd0, comp1bnd1, comp1bnd2.

In my case this could mean:

porosity0radius0, porosity0radius1, porosity0radius2, porosity1radius0, porosity1radius1, porosity1radius2.

or

radius0porosity0, radius0porosity1, radius0porosity2, radius1porosity0, radius1porosity1, radius1porosity2.

The order is relevant to know, because npartype is the column vector for the partype_volfrac Matrix.

Therefore the order of the columns need to be known to initialize this matrix.

The partype_volfrac Matrix in the example would look like one of these:

or

Hope someone can clarify which one of these 2 options is correct.