Flash Pseudo Stream
The general dew point and bubble point flash types can have only one product phase (vapor and liquid respectively). However, PRO/II allows you to specify an imaginary vapor phase stream for a bubble point flash, and an imaginary liquid phase stream for the general dew point flash. These streams are called pseudo streams and you can enter a flowrate for these streams.
These streams are typically used for calculation of various parameters in other flowsheet units (calculator, for example) in the simulation.
Usage
The pseudo stream data entry field is available in the Flash Main Window, only when the general dew point or bubble point flash type has been selected. See Flash Types for information on selection of these flash types.
Enter a value for the pseudo stream rate. You may change the rate units through the Unit-Of-Measure Selection Window, which is displayed when the UOM button on the Toolbar is pushed.
Alternatively, instead of entering a numeric value for the pseudo stream rate, it may be referenced using the Define system relative to any available unit operation or stream parameter calculated elsewhere in the simulation. See Flash Parameters available for Cross-Referencing for more details.
Related Topics