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Hello everyone,,i'd like to know how to derive the Christiansen correction factor F in a pipe with multipe outlets

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Hello everyone,,i'd like to know how to derive the Christiansen correction factor F in a pipe with multipe outlets... F = 1/(m 1)   1/(2N)  ((m-1)^0.5)/(6N)^2).. i've looked everywhere for 2 weeks and cant seem to find anything HELP please

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