Multi-phase flow in centrifugal oil separator

alenp07 · April 13, 2012, 06:53

Hi
Im doing a steady state multi-phase flow simulation for an oil separator used in automobile cooling system which is of centrifugal type.
The primary phase is CO2 and the secondary phase is PAG (Poly Alkaline Glycol-density 1030kg/m3 nd viscosity 49.6 Pa.s)

The inlet droplet diameter is 10 micro meter
Inlet volume fraction of liquid is 0.007

I used Mixture model, with mixture inlet as velocity inlet and oil and gas separated outlet as pressure outlet

Turbulence model adopted is RNGKE...

My problem is the inlet mass flow rate is coming some 112kg/s

thats no way possible.

I used hex mesh and tet mesh generated using ICEM cfd. Im pretty sure that there is some problem with my boundary conditions.

Can any one please help?

tim.sonderby · June 20, 2012, 10:51

you could make a calculation on the inlet to make sure that that you have done the calculation correctly.

another option would be to change the inlet from velocity to mass

April 13, 2012, 06:53	Multi-phase flow in centrifugal oil separator	#1
alenp07 New Member Join Date: Apr 2012 Location: IN Posts: 24 Rep Power: 14	Hi Im doing a steady state multi-phase flow simulation for an oil separator used in automobile cooling system which is of centrifugal type. The primary phase is CO2 and the secondary phase is PAG (Poly Alkaline Glycol-density 1030kg/m3 nd viscosity 49.6 Pa.s) The inlet droplet diameter is 10 micro meter Inlet volume fraction of liquid is 0.007 I used Mixture model, with mixture inlet as velocity inlet and oil and gas separated outlet as pressure outlet Turbulence model adopted is RNGKE... My problem is the inlet mass flow rate is coming some 112kg/s thats no way possible. I used hex mesh and tet mesh generated using ICEM cfd. Im pretty sure that there is some problem with my boundary conditions. Can any one please help?

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June 20, 2012, 10:51		#2
tim.sonderby New Member Tim Sønderby Join Date: Jun 2012 Posts: 5 Rep Power: 14	you could make a calculation on the inlet to make sure that that you have done the calculation correctly. another option would be to change the inlet from velocity to mass