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Fluid
Flow Design and Consulting
|
 |
For each example below you need
to download a FluidFlow3 file and run it on your copy of the
software. The model flowsheets are fully anotated with explanation.
Select the download link, or copy and past into your browser,
to go to our FTP site.
EXAMPLE
1: HYDRAULIC GRADE LINE AND ABSOLUTE ZERO
| Download
File Name: |
Hydraulic
Grade Line and Absolute Zero.ff3 |
| Module(s)
Required: |
Liquid |
| Aspects
illustrated: |
Multiple
models on one flowsheet.
Absolute negative pressure in a pipeline. |
| Comments |
Multiple
Models:FluidFlow3 allows for multiple models on the one flowsheet.
This example shows two versions of the same model. When flow
takes place via a high point in a pipeline, the pressure must
inevitably fall. If the hydraulic grade line falls to about 10.2m
below the pipe centre-line the pressure falls to absolute zero.
The model as downloaded detects this and reports a Calculation
Error. View the flowsheet for details. Note - the even though
the lower model has solved successfully, FluidFlow3 does not
indicate this. Turn off the upper pump and the flowsheet solves. |
EXAMPLE
2: MULTIPLE COMPONENTS
| Download
File Name: |
Multiple
Components.ff3 |
| Module(s)
Required: |
Liquid |
| Aspects
illustrated: |
Multiple
components |
| Comments |
The
use of the Inspector | Quantity option to set, for instance,
one elbow element to represent several, can help keep a model
simple and easy to navigate. |
EXAMPLE
3: MANIFOLDS AND TEE JUNCTIONS
| Download
File Name: |
Manifold.ff3 |
| Module(s)
Required: |
Liquid |
| Aspects
illustrated: |
Tee
junctions |
| Comments |
Tee
junctions are extensively described in Design
Note 02. Where a tee junction's properties falls outside
the experimental range of the data used in FluidFlow3, convergence
might not be achieved. A solution is to use a Connector with
no Resistance as shown in this example. |
EXAMPLE
4: Kv GENERAL FITTING AS A "BLACK BOX"
| Download
File Name: |
Kv
Black Box.ff3 |
| Module(s)
Required: |
Liquid |
| Aspects
illustrated: |
Kv
Component
Reducing sections of a model to a single Kv element. |
| Comments |
Some models will include combinations
of pipes and equipment which may be fairly complex, perhaps repetitive
in the model and/or not be active for particular case studies.
These "clusters" of pipes and equipment items can be
reduced to the equivalent Kv component, making the model much
easier to solve and navigate.
The download model shows a small
network of pipes and sprinklers - a typical deluge system. There
may be many of these tying into a ringmain. The pressure loss
relationship across the sprinkler system is a function of Q^2.
This is the relationship that the Kv element uses. So the method
is to solve the sprinkler system with a typical head or flow
set at the boundary node and then use the two properties to create
a Kv element. This element then replaces the cluster of pipes
and nozzles.
This if further discussed in
Design Notes 04
and 08
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