Determining duct pressure loss characteristic from one set of data

[MechEng92]

I have 3 sets of results from CFD analysis of different sized ducts in terms of length, width, and depth. I'm trying to find if it's possible to use the characteristic of just the scenarios to predict pressure drop in any duct size by changing the dimensions.

To begin with, I have created a second order trend of coefficients for scenario 1. Then I have used ratios of dimensions of scenario 1 vs scenario 2 to create manipulated coefficients. I have then plotted the data against the CFD results of scenario 2. However, this method does not give accurate results and the higher the airflow the larger the difference.

Any suggestions?

 

[AdrienneGC]

Hi, are you asking for the equations to solve for pressure drop given length and cross-sectional area of the duct? I created a calculator that I think does what you are looking for

https://www.adicotengineering.com/duct-size-calculator.

I defaulted to a length of 100'.

I don't know anything about CFD but happy to work through this with you if I can help in any way.



Adrienne Gould-Choquette, P.E.

http://www.adicotengineering.com