What are Some Good Online References for Head Loss Coefficients in Ductwork?

[ajk108]

I am working on a project at my summer internship rerouting some duct work and want to do some calculations to see how much changing some of the 90 degree angles in the duct will improve flow. I don't have my Fluids text with me and was wondering if anyone knew of any good references online to get the head loss coefficients for various duct shapes. Thanks.

 

[minger]

The Crane Paper #410 is pretty much standard reference for pipe flows and losses.