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