Use the Reactions node to account for the consumption or production of species through chemical reactions. Define the rate expressions as required.
From the Selection list, choose the domains on which to define rate expression or expressions that govern the source term in the transport equations.
Add a rate expression Ri (SI unit: mol/(m3·s)) for species i. Enter a value or expression in the field. Note that if you have the Chemistry interface available, provided with the Chemical Reaction Engineering Module, the reaction rate expressions can be automatically generated and picked up using the drop-down menu. For an example, see the application Fine Chemical Production in a Plate Reactor as linked below.
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For Total volume, the reaction expressions in mol/(m3·s) are specified per unit volume of the model domain (multiplied by unity).
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For Pore volume, the reaction expressions in mol/(m3·s) are specified per unit volume of total pore space. The reaction expressions will be multiplied by the domain porosity, εp. (εp equals unity for nonporous domains).
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For Liquid phase, the reaction expressions in mol/(m3·s) are specified per unit volume of liquid in the pore space. The expressions will be multiplied by the liquid volume fraction θ. (θ equals εp for Saturated Porous Media domains).
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For Gas phase, the expressions are multiplied by the gas volume fraction av = εp − θ. av equals 0 for Saturated Porous Media domains.
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See the theory chapter on chemical species transport, starting with the section Mass Balance Equation.
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