Dear Friends, If i use 1 for KL in the outlet vent boundary condition, which pressure i have to take for calculating the pressure drop across a duct. I given 1 in view that all the dynamic head will be lost. is this assumption right? can i take static pressure at outlet and total pressure at inlet for calculating the pressure drop?

Thanks in Advance.

I think if you're assuming your duct exhausts into a farfield-like condition then a headloss of 1 would be reasonable (e.g. water through a pipe which dumps onto the ground).

Yes john i am doing a similar case. In my case i am exhausting gas into atmosphere. Can i take static pressure at outlet and Total pressure at inlet for calculating pressure drop?

Thanks in advance