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### Restrictor, Bend

Figure 54: Geometry of a bend

The geometry of a bend is shown in Figure 54. There are three types: TYPE = RESTRICTOR BEND IDELCHIK CIRC, TYPE = RESTRICTOR BEND IDELCHIK RECT, both with loss coefficients according to [22] and TYPE = RESTRICTOR BEND MILLER with coefficients taken from [39]. In the first and last type the bend is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE = RESTRICTOR BEND IDELCHIK CIRC or TYPE = RESTRICTOR BEND MILLER card):

- cross section .
- radius of the bend .
- bend angle .

They apply to circular cross sections. For rectangular cross sections the constants are as follows (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR BEND IDELCHIK RECT card):

- height .
- width .
- radius of the bend .
- bend angle .
- oil mass flow in the restrictor (only if the OIL parameter is used to define the kind of oil in the *FLUID SECTION card)

The loss coefficients are those published by Idelchik [22] and Miller [39].

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