Pressure drop
Pressure drop
(OP)
Hi,
I am trying to determine the pressure drop across a pipe reduction, from 6" pipe to 1" pipe. The volumetric flow rate is 4.5m3/min.
Is there a k value for a reduction of this size? or is there an equivalent length for a reduction in pipe of this magnitude?
I would like to see how the pressure varies as the flow rate varies.
assume kinematic viscosity = 0.0000011m2/s
Density = 998kg/m3
Any help with this problem would be greatly appreciated
I am trying to determine the pressure drop across a pipe reduction, from 6" pipe to 1" pipe. The volumetric flow rate is 4.5m3/min.
Is there a k value for a reduction of this size? or is there an equivalent length for a reduction in pipe of this magnitude?
I would like to see how the pressure varies as the flow rate varies.
assume kinematic viscosity = 0.0000011m2/s
Density = 998kg/m3
Any help with this problem would be greatly appreciated





RE: Pressure drop
RE: Pressure drop
RE: Pressure drop
RE: Pressure drop
RE: Pressure drop
RE: Pressure drop
suggest you google flow through nozzles - a heap of info there for you.
RE: Pressure drop
The pressure varies as the square of the flowrate.
Double the flowrate the presure increeases x 4
RE: Pressure drop
RE: Pressure drop
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RE: Pressure drop
RE: Pressure drop
To accelerate the water to give 4.5 m3/min through a 1" nozzle (i.e. 440 ft/sec) takes 1300 psi. The pressure drop through the 6" to 1" reducer will depend on the profile of the reducer. A 30 degree conical reducer would give a pressure drop of about 300 psi. So I would say you need about 1600 psi in the 6" pipe to give this flow.
All numbers are approximate because we do not have accurate dimensions.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Pressure drop
RE: Pressure drop
Don't know whether you've read my post (ref. 23 Jun 10 5:41). Using the approach reported there I got approx 2900 psi pressure drop (with a coefficient of discharge C = 0.95). Cannot understand how you've calculated 1600 psi, could you expand?
RE: Pressure drop
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Pressure drop
thanks for your swift and detailed (as always) reply.
RE: Pressure drop