[omidiut]

Hi all

i'm trying to simulate flow in restriction orifice with this boundary condition:

mass flow rate: 5.71 kg/s
Inlet pressure : 151 bar
outlet pressure :8 bar

my problem is find size of orifice to achieve this pressure drop.
first i use total pressure as inlet boundary condition and static pressure as outlet boundary condition. the calculated mass flow rate is: 5.9 kg/s
Second i use total pressure as inlet boundary condition and mass flow rate 5.71 kg/s as outlet boundary condition to investigate how much is the pressure drop of this orifice but the outlet calculated pressure is: 93.7 bar.
what does it mean? finally this orifice can provide 143 bar pressure drop?have my simulation any problem?


Best regards.