Transport and solution volume

[Flopi]

Dear Forum,
I have a dumb question. I'm pretty sure I have the answer but I would like to get a confirmation.

What is the pore volume considered in the TRANSPORT keyword. In other words, if I want to model the transport of solid through a core of porosity 10% and if I want to divide it into cells of 2mm length each, what is the mass of water associated with each cell ?

My intuition would be 1kg. Is it then correct to assume that the "cross section" and thus the volume of each cell (in order to calculate the quantity of each reactive mineral per cell) is adapted to accomodate 1kgw per cell? (in my case a volume per cell of 10L for a density of 1 and a cross section of 50000 cm2) ?

[dlparkhurst]

Usually, the volume of each cell and the infilling solution is about 1 L. By default a SOLUTION definition is scaled to 1 kg of water, which is about 1 L. So normally, you define SOLUTIONs for the infilling solution and the cells and they are all about 1 L. (You could define another volume with the -water option of SOLUTION, but it is confusing enough already.)

So, yes, normally each cell has the same volume of 1 L. You should define other reactants, which all have units of moles (EQUILIBRIUM_PHASES, EXCHANGE, etc) as the number of moles per liter of water.

Note that you can define different lengths to cells to accommodate changes in velocity; longer cells have higher velocities (m/time step).