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### Restrictor, Wall Orifice

Figure 55: Geometry of a wall orifice

The geometry of an wall orifice is shown in Figure 55. It is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR WALL ORIFICE card):

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

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