DIERS Benchmarks

Two-phase Frozen Flow  Nitrogen blanket             Download

The DIERS two-phase frozen flow involves sub-cooled water under 72.2 psia nitrogen pressure. The flow is frozen meaning that there is no flashing of the saturated water.  The water is sub-cooled at 72.5 psia.  The water will not flash but the nitrogen will expand as the pressure decrease as it flows through the inlet pipe, enters the nozzle and exits the discharge pipe.  The physical properties are based on saturated water at its partial pressure of 72.5 and the nitrogen gas based on its specific volume changes as it enters inlet pipe, flows through the relief nozzle, and exits the discharge pipe.   The saturated water properties at 72.5 psia and 305.4 o F,  remain constant throughout the flow path.  Only the nitrogen will expand.

Two-phase Frozen flow Steam blanket

For the next case of two-phase frozen flow instead of a nitrogen blanket the blanket will be steam at a pressure of 72.5 psia.  The water will remain sub-cooled at 72.5 psia.  Only the steam will expand and the water will remain without flashing. The steam properties will be taken at each pressure increment.

Mach II   Results for Steam blanket                Download.

Frozen Flow Results                

                                           Flow rate (lbs/hr)        Choke (psia)        Quality (x)         Inlet dP / %Pset          Outlet dP /% Pset         Piping

                                                240,500                         39.6                      0.01                     ----------                           ----------                nozzle N

                                                230,103                         37.8                      0.01                       3.2 / 6.1                           3.3 / 6.3               4 X 6  N

                                                237,559                         39.0                      0.01                      0.93 /1.8                          3.6 / 6.9               6 X 6  N

                                               203,557                          39.6                      0.01                        ---------                             ---------              nozzle  S

                                               186,214                          35.9                      0.01                      5.8 / 11.1                          2.5 / 4.7               4 X 6    S

                                               198,041                          38.4                      0.01                       2.0 / 3.9                            2.9 / 5.4               6 X 6   S

DIERS Results               
                                           Flow rate (lbs/hr)       Choke (psia)         Quality (x)        Inlet dP / %Pset             Outlet dP /% Pset       Piping

RRERSP                                234,229                           40.9                     0.01                          -----                                   --------              nozzle N

RRERSP                                222,882                           38.6                     0.01                       2.8 / 5.4                            1.8 / 3.4             4 X 6 N

Grolmes                               199,337                           42.4                     0.01                       3.0 / 5.7                            1.5 / 2.9             4 X 6 N

RRERSP                               230,289                            40.0                     0.01                       0.6 / 1.1                            1.9 / 3.6             6 X 6 N

RRERSP                               193,772                            42.5                     0.01                         -------                                 --------               nozzle S

RRERSP                               184,914                            40.5                     0.01                       2.7 / 5.2                            1.7 / 3.3             4 X 6 S

Shaw                                    199,337                            42.4                     0.01                       3.3 / 6.3                            2.1 / 2.9             4 X 6 N

RRERSP                                191,186                           41.8                     0.01                       0.5 / 0.9                            1.9 / 3.6             6 X 6 S