Pressure drop equation & resistance coefficient values for fittings
Pressure drop equation & resistance coefficient values for fittings
(OP)
Hi,
I would like someone to help me confirm the Darcy-Weisbach pressure drop equation based on liquid flowrate. I would also like a reference to or scanned copy of resistance coefficients for fittings particularly reducers and y-type strainers.
I would like someone to help me confirm the Darcy-Weisbach pressure drop equation based on liquid flowrate. I would also like a reference to or scanned copy of resistance coefficients for fittings particularly reducers and y-type strainers.





RE: Pressure drop equation & resistance coefficient values for fittings
For the reducers, do you have any engineers around with a copy of Crane? They have formulas in there to calculate the resistance coefficient of fittings. I have not seen tabulated values of these and frankly, the dP across a reducer is usually insignificant compared to the entire piping system.
RE: Pressure drop equation & resistance coefficient values for fittings
RE: Pressure drop equation & resistance coefficient values for fittings
RE: Pressure drop equation & resistance coefficient values for fittings
delta p = f * L * v^2 * density / (2 * D * g) = headloss * density
Remember: The Chinese ideogram for “crisis” is comprised of the characters for “danger” and “opportunity.”
-Steve
RE: Pressure drop equation & resistance coefficient values for fittings
http://www.craneco.com/flow_fluids.cfm
Mine is the 7th printing and has Darcy but i didn't find Darcy -weisbach... it may be in later editions?
JMW
www.ViscoAnalyser.com
RE: Pressure drop equation & resistance coefficient values for fittings
The Darcy-Weisbach equation is the classical expression for the pressure drop of a liquid fluid through a hydraulic system. It is the one explained and employed in the Crane TP #410. The "Darcy" equation is a totally different beast.
You would waste your time in "confirming" the veracity of the Darcy-Weisbach equation. This has been done countless times and is an accepted fact for well over 75 years. Glenn Brown at Oklahoma State U has an excellent website dedicated to Henry Darcy:
biosystems.okstate.edu/darcy/DarcyWeisbach/ Darcy-WeisbachEq.htm
You might enjoy reading his explanations.