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### Restrictor, Enlargement

Figure 52: Geometry of an enlargement

The geometry of an enlargement is shown in Figure 52. It is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR ENLARGEMENT card):

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

The loss coefficient for an enlargement is taken from [22].