Hello Everybody! Do anyone know coefficient of friction for air. I try to calculate distance of Fan. I have some datas below volumetric flow rate mass flow rate Air speed at exit of Fan Fan Power Thanks for help

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Ok. Thank you. Actually I try to calculate air throw distance for Axial Fans for cold room applications. I know it's depend temprature, pressure, density or another things. Do you have any idea, formula or documents about that???

The best way to model the "friction" due to a fluid like air is to use drag, and specifically, the drag equation. Since how much drag you get depends, not only on the fluid, but on the shape of the object you have in the fluid, there are terms in the drag equation to account for that.

Prometheus, I thank you for explanation and your links. So you are right for drac cofficient but it generally about air on kind of shaeps. I go on research if I find any solution, I'll share this topic.