The domain selection inherits all valid domains from its parent feature. For the invalid domains, it shows not applicable.

Select All or one of existing pellets for the node.

A reaction takes usually place in the porous part (fluid) of the pellet, but can also in the whole volume of the pellet. When specifying reaction rate for a bulk species, the specified reaction rate has the basis of the pore volume, or the total volume. With the Pore volume selected, the reaction expression in mol/(m3·s) will be multiplied by porous layer’s porosity εpr.

Select a reaction rate (SI unit: mol/(m3·s)) for bulk species i from Rpe, i list. Enter a reaction rate expression when User defined is selected from the list. Alternatively, if reaction rate expressions have been defined in a Chemistry interface (with the Define variables for porous pellets selected under Pellet Chemistry section), they can be chosen from the list.

Specify the Heat source originating from the heat (Qpe) of the bulk reactions inside the porous layer. With several pellets being added, their heat sources will be summed up.

The heat sources are most conveniently picked up from a Chemistry interface (with the Define variables for porous pellets selected under Pellet Chemistry section) that defines the reaction rate and the heat of reactions. In that case, the heat source expression can be selected from the list. Otherwise you can enter an expression in the text field.