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Restrictor, Bend

Figure 76: Geometry of a bend
\begin{figure}\epsfig{file=Bendgas.eps,width=11cm}\end{figure}

The geometry of a bend is shown in Figure 76. There are three types: TYPE = RESTRICTOR BEND IDEL CIRC, TYPE = RESTRICTOR BEND IDEL RECT, both with loss coefficients according to [28] and TYPE = RESTRICTOR BEND MILLER with coefficients taken from [46]. 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 IDEL 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 IDEL RECT card):

The loss coefficients are those published by Idelchik [28] and Miller [46].

By specifying the parameter LIQUID on the *FLUID SECTION card the loss is calculated for liquids. In the absence of this parameter, compressible losses are calculated.


Example files: restrictor, restrictor-oil.


next up previous contents
Next: Restrictor, Wall Orifice Up: Fluid Section Types: Gases Previous: Restrictor, Contraction   Contents
guido dhondt 2012-10-06