Hydraulics help

1. May 17, 2005

Clausius2

Is there some reason for Hazen-Williams friction model to failure in a hydraulic circuit?.

I have simulated an hydraulic system in a commercial code, and this model is the unique which gives stupid results like infinite volumetric rates. The Reynolds is about 10^5.

2. May 17, 2005

FredGarvin

My reference as well as the web site here (http://www.piping-toolbox.com/6_797.html) show that you are right on the edge of $$R_e$$ for using Hazen-Williams. Also, are you possibly outside the realm of this:
I guess after we discount those two notions, the model will have to go under the microscope. Is there any way to compare your model to Darcy?

Last edited: May 17, 2005
3. May 18, 2005

Clausius2

It doesn't help too much, but thanx anyway .

The problem is I have to switch between friction models when calculating an hydraulic installation, but this model is the unique which spends the longer computational time and gives unbelievable results. I was searching for same sort of conditions in which this formula is applicable, but I haven't found nothing interesting for justifying this fact.