Compressible Flow Pressure Drop Equations
Compressible Flow Pressure Drop Equations
(OP)
Hello all,
I have been searching and can not seem to find any equations to calculate the pressure drop around pipe bends for compressible flow. I was hoping to end up solving for a pressure differential using the fluid properties (including flowrate/velocity), pipe diameter, bend radius, and pipe roughness. I'm trying to equalize the pressure drop across multiple pipes with different geometry, but with the same fluid properties and initial pressure. Depending on the structure of the equations, perhaps I can eliminate several of the parameters that are held constant. Thanks for your help,
--Bryson
I have been searching and can not seem to find any equations to calculate the pressure drop around pipe bends for compressible flow. I was hoping to end up solving for a pressure differential using the fluid properties (including flowrate/velocity), pipe diameter, bend radius, and pipe roughness. I'm trying to equalize the pressure drop across multiple pipes with different geometry, but with the same fluid properties and initial pressure. Depending on the structure of the equations, perhaps I can eliminate several of the parameters that are held constant. Thanks for your help,
--Bryson





RE: Compressible Flow Pressure Drop Equations
Because you seem to more interested in the differences in pressure drop between the different bends I suspect that you could extend this assumption up to a pressure drop of around 25% of the absolute pressure without introducing significant errors.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Compressible Flow Pressure Drop Equations
If you want to exactly calculate the balance flow for this case, yould likely either need to run a 3D CFD model or run a scaled down physical model. Although there are posted standard loss coefficients for elbows, these loss coefficients are not accurate in the case of multiple out of plane elbows- you can only account for pre-swirldue to an upstream elbow using 3D CFD or a scale model.