Forum about flow calculators available on pipeflowcalculations.com and how to find solution for your fluid flow problem.
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A couple of other engineers and I are working on an exhaust system and think it would be handy to be able to calculate the free area, crescent shaped of course, created by the operation of a blast gate/knife gate to a partial position inside a round exhaust duct. We can assume that the frontal edge of the gate will have the same radius as the duct. We are wanting to create a formula that will allow us to figure the free area for any given position of the damper/gate. Does anyone know of such an equation?