Correlation for stack friction factor?

[LaSalle1940]

Does anyone know of a source for a correlation for friction factors in natural-draft stacks and chimneys, particularly small (let's say 2 ft and under) diameters? I've seen the charts in Perry; naturally, those are rather small and not particularly spreadsheet-friendly.

 

[Flareman]

You could use the colebrook correlation which you can find at

http://www.cheresources.com/colebrook1.shtml.

David

 

[ades]

You can also use the churchill equation, its more direct.
You still need the rugosity coefficient depending on the type of material.