Fluid Flow mode for the RR1 example simulation

The purpose of Fluid Flow mode is to rate the system as configured in Process mode. You can adjust the pipe sizes and lengths as required to satisfy the design requirements in the table in Process descripton for the RR1 example simulation. Specifically, make sure that the velocity in any of the pipes does not exceed the critical velocity. We configure the pipe sizes in Fluid Flow mode in the backwards direction, opposite of flow. We configure the pipe sizes by doing the following:

1. Specify the pressure in the Sink, which represents the pressure in the vacuum column flash zone.

2. Set the Size of VTL3 to achieve the required velocity. If the diameter is too small, the velocity will be too high entering the column. If the diameter is too big, you will have high velocity in the upstream pipe VLT2.

3. Set the Size of VTL2 to achieve the required velocity in the last segment. You can also redistribute the length of VLT3 (by changing the location of the Enlarger) to change the back pressure, which will change its velocity.

4. Repeat step 3 until all of the pipes are close to the target velocity.

We have sized the pipes to ensure that the velocity in the pipes does not approach the critical velocity. If it is not possible to achieve the desired velocity profile, then you may need to return to Process mode to add another enlarger and redistribute the pipe lengths for each section of constant diameter pipe.