I know about the velocity of air being used, size of the duct, CFM being handled by the duct section. Also the fact that the bell mouth should be tapered at 45 degrees for smooth entry/exit of air. I also know about the equation Q=Av. Using all this information, how to find the maximum size of the bell mouth? I am confused because using this information given cross-sectional area of the duct and hence the area of the bell mouth at the duct side. How to find area at the larger end (where the air enters/leaves) the system? Could any one help with an example?
Thanks to all in advance.
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