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### Restrictor, Contraction

Figure 53: Geometry of a contraction

The geometry of a contraction is shown in Figure 53. It is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR CONTRACTION card):

- reduced cross section .
- full cross section .
- hydraulic diameter defined by where is the perimeter of the cross section.
- chamfer length .
- chamfer angle .

The loss coefficient for a contraction is taken from [22].