Bed Inlet
This node specifies an input for the pore conditions in the solid catalytic pellets in a moving packed bed. Together with it, a Bed Outlet node should be also added. The solid pellet bed is rigid, the Bed Inlet and Bed Outlet are usually set to opposite boundaries.
Boundary selection
Select boundary where the solid catalytic pellet bed moves into the reactor. These boundaries belong to the pellet domains which are defined in Porous Material.
inlet pellet concentrations
There are three ways to specify the pellet inlet conditions.
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From bed fluid conditions. The species mass fractions inside the catalytic pellet are the same as that in the fluid (between pellets).
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From pellet initial values. The species mass fractions inside the catalytic pellet are the same as the initial values under the Pellets node.
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User defined. There are three different kinds of concentration inputs from the Mixture specification list.
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Mass fractions. Enter the inlet mass fractions in the Mass fractions text fields.
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Mole fractions. Enter the inlet mole fractions in the Mole fractions text fields. The temperature and pressure will be taken from the fluid between pellets at the boundary.
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Molar concentrations. Enter the inlet molar concentrations cpe0,i (SI unit: mol/m3) in the Molar concentrations text fields. The pressure will be taken from the fluid between pellets at the boundary.
The surface species concentration table is available if there is any surface reaction inside the catalytic pellet and the inlet conditions is set to From bed fluid conditions or User defined. Enter the inlet surface concentration (SI unit: mol/m2) in the surface species table.
The surface species concentration table is not available when the inlet conditions is set to From pellet initial values. In this case, the inlet surface concentrations are taken from the Initial Values node.