PhreeqcUsers Discussion Forum

Conceptual Models => Design of conceptual models => Topic started by: jLi200H on November 05, 2018, 10:53:22 PM

Title: Adding Flow Kinetic Term in Model
Post by: jLi200H on November 05, 2018, 10:53:22 PM

Hello,

I’ve been using PHREEQC to model multi-component glass leaching using water with zero flow. The aim has been to determine the concentration of various leached species as a function of time in the solution surrounding the glass. There is no spatial dependence in the model, and so, my simulations have involved applying glass dissolution equations by use of the KINETICS data block only with no TRANSPORT. My simulation results were fine.

I’m now trying to introduce the effect of constant flow within the KINETICS. I would like to assume that the rate of loss of a particular leached species in solution as a function of time is equal to the concentration of that particular leached species in solution at time t, multiplied by a constant determined from the flow rate.

Ideally, I’d like to introduce this change purely by using the KINETICS data-block only. Please can you advise me on how I might do this? particularly given that there are many different leached species to consider.

Many thanks for your help in advance.

Title: Re: Adding Flow Kinetic Term in Model
Post by: dlparkhurst on November 05, 2018, 11:13:42 PM

You can try to do it all with KINETICS, but I would use TRANSPORT or ADVECTION.

Title: Re: Adding Flow Kinetic Term in Model
Post by: jLi200H on November 15, 2018, 10:34:00 AM

Many thanks for your help.