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How can I calculate equilibrium temperature?


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There are a couple ways to do this. In GSS, you can add multiple samples, each with a different temperature and solution mass (to specify the mixing ratios). Then just find the Analysis tab near the top and select "Mix Samples". Choose which samples you would like to mix and GWB will calculate the temperature of the mixture.


If you're mixing two fluids in React, you'll need to define one fluid in the Basis pane and another in the Reactants pane. To define the Reactants fluid, you might enter its composition in the Basis pane, then run your model and "pickup" the results as Reactants. The Basis pane will now be free so that you can define your second fluid. Once the fluids in the Basis pane (the initial system) and the Reactants pane are set, go to the bottom of the Basis pane and fine the "+" button next to temperature. Set a temperature for the initial system (the fluid in the Basis pane) and the reactant fluid. As the reactant fluid is added into the initial fluid, React will calculate the temperature of the mixture using the mass and temperature of each fluid. React will use the heat capacity values you specify for a general "fluid" and "mineral".


You might look into Sections 3.4 and 3.9 of the GWB Reaction Modeling Guide, or find the keywords "cpw" and "cpr" in the GWB Reference Manual. Chapter 14 of the Geochemical and Biogeochemical Reaction Modeling text will also be helpful here.


Hope this helps,


Brian Farrell

Aqueous Solutions LLC

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