The Vacuum Pump node models the effective outlet volume flow rate created by a vacuum pump device that is attached to an outlet.
The Flow condition option defines a lumped curve —
Vacuum pump performance curve, linear;
Vacuum pump performance curve, data; or
Vacuum pump performance curve, user defined.
For the Vacuum pump performance curve, linear option, values or expressions should be specified for the
Ultimate pressure pult and the
Pumping rate at ambient pressure V0,amb.
The Vacuum pump performance curve, data option can be used to enter or load data under the
Vacuum Pump Performance Curve Data section below. The interpolation between points given in the
Vacuum Pump Performance Curve Data table is defined using the
Interpolation function type list in the
Vacuum Pump Performance Curve Interpolation section.
The Vacuum pump performance curve, user defined option can be used to enter a different value or expression. The suction pressure on the selection where this boundary condition is applied is defined by
phys_id.item.id.pAverage where
phys_id is the name of the physics interface and
item.id is the name of the feature (for example,
phys_id is
spf and
item.id is
pmp1 by default for the first instance of the
Vacuum pump boundary condition in the single-phase flow physics interface). In order to avoid unexpected behavior, the function used for the vacuum pump performance curve is the maximum of the user-defined function and 0.
This section displays when Vacuum pump performance curve, data is selected as the
Flow condition. In the table, values or expressions for the
Suction pressure and
Pumping rate should be specified. Alternatively, a text file can be imported by clicking the
Load from file button (
) under the table.
This section is available when Vacuum pump performance curve, data is selected as the
Flow condition. Units can be specified here for the
Suction pressure and
Pumping rate.
This section is available when Vacuum pump performance curve, data is selected as the
Flow condition. The available options for the
Interpolation function type are
Linear,
Piecewise cubic, and
Cubic spline.
