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i'm designing a orifice meter, venturi meter, for a project in my college. The problem i'm facing now is, if the beta ratio to be calculated depends on pipe diameter or not. The pipe diameter for my project is 2 inches and air is the working medium. And does the same problem account for venturi meter also? Approx. i'm planning to keep beta=0.5 since the calculations are tedious. can anybody help in this problem?