Divide the discharge flow rate (in cubic meters per second) by the discharge velocity im m/s. This wil give you the chimney inside cross section pi D^2/4, in square meters.
Multiply that area by (4/pi) and take the square root of the result, for the diameter, D.
In other words,
D = sqrt[(4/pi)*flow rate/velocity]
This problem requires a bit of physics as well as math.
how do you find the diameter of an industrial chimney having only discharge flowrate and discharge velocity
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