Outlet Vent Loss Coefficient
 

Dear All,

I am modeling airflow in a pipe - mass flow inlet and a pressure outlet at the ends of the pipe. Inbetween, I'd like to place an outlet vent, which is to exhaust to the atmosphere.

Would someone have a recommendation what are reasonable values/coefficients for the pressure loss @ the vent? I read the FLUENT manual but couldn't find specific values I could use.