Pressure loss through a straight pipe

surya93jith · May 18, 2019, 21:25

I have a straight pipe of 0.43" ID. I am trying to determine the pressure loss through a straight pipe of 1 m. I only know the Inlet pressure. I do not know the flow rate or the inlet velocity. I set my gauge pressure/Inlet pressure to 800 Psi. What should my outlet condition be? I tried setting it to outflow but I am getting reversed flow. What is a better boundary condition at the outlet?

Rj33320 · May 18, 2019, 23:09

Keep it as pressure outlet. Fluent will calculate the pressure at outlet.

LuckyTran · May 19, 2019, 14:44

There's not enough info.

Knowing only the inlet pressure and pipe length doesn't define the problem. Any mass-flow rate, any pipe length, will satisfy this constraint.

May 18, 2019, 21:25	Pressure loss through a straight pipe	#1
surya93jith New Member Surya Sarvajith Join Date: May 2019 Posts: 1 Rep Power: 0	I have a straight pipe of 0.43" ID. I am trying to determine the pressure loss through a straight pipe of 1 m. I only know the Inlet pressure. I do not know the flow rate or the inlet velocity. I set my gauge pressure/Inlet pressure to 800 Psi. What should my outlet condition be? I tried setting it to outflow but I am getting reversed flow. What is a better boundary condition at the outlet?

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May 18, 2019, 23:09		#2
Rj33320 New Member Rajesh Join Date: Apr 2018 Posts: 5 Rep Power: 8	Keep it as pressure outlet. Fluent will calculate the pressure at outlet.

May 19, 2019, 14:44		#3
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	There's not enough info. Knowing only the inlet pressure and pipe length doesn't define the problem. Any mass-flow rate, any pipe length, will satisfy this constraint.