 
 
 
 
 
 
 
  
Properties: adiabatic, not isentropic, directional,  -outlet based restrictor
-outlet based restrictor
An entrance element is used to model the entry from a large chamber into a gas
pipe. For an entrance the value of  is 0.5. It is described by the following constants (to be specified in that order on
the line beneath the *FLUID SECTION, TYPE=RESTRICTOR
ENTRANCE card):
 is 0.5. It is described by the following constants (to be specified in that order on
the line beneath the *FLUID SECTION, TYPE=RESTRICTOR
ENTRANCE card):
 as upstream section)
 as upstream section)
 .
.
 defined by
 defined by  where
 where  is the
  perimeter of the cross section.
 is the
  perimeter of the cross section. 
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.