I am looking at placing an impingement plate on the end of a 5' diameter stack. We are looking at placing it 10' (two pipe diameters) above the stack. I am interested in whether there may be enough back flow off of the plate that might cause a flow disturbance in the stack itself. We are doing some environmental stack testing and are looking for a low flow discontinuity.
I am not sure what math to go through to evaluate.
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