The purpose of the Chemistry Options dialog box is to specify whether solute transport will be used and, if so, which reactants will be used as well as the diffusivity. The Chemistry Options dialog box is displayed by selecting PHAST Options|Chemistry Options... The options that are available are
To use solute transport in a model, the check box labeled "Use solute transport" must be checked. If it is checked, the other options become enabled. A particular reactant will be used in the model if the check box next to it is checked. Note however, that even if a check box is unchecked, data sets related to that option still will be present in the Data Sets dialog box. (See p. 39.) However, the data sets that are not used directly in the model will be shown in italics and with a light gray background. Data sets that are not used directly in the model can still be used in the formulas for other data sets that are used and thus may still have an influence on the model. The user must define the reactants to be used in the chemistry data file and define their initial conditions in the appropriated data set for each type of reaction.
The diffusivity in the model is specified in the edit box labeled “Diffusivity”.