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Title: Venturi Tube Discharge Coefficients
Author: m. J. Reader-Harris, W. C. Brunton, J. J Gibson, D. Hodges, I. G. Nicholson
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: This paper describes 15 Venturi tubes manufactured in a range of diameters from 50 mm to 200 mm and of diameter ratios from 0.4 to 0.75. They have been calibrated in water and high-pressure air. An equation for the discharge coefficient in water has been obtained with an uncertainty of 0.75 per cent. In air the situation is considerably more complicated. Equations fitting all the air data with an uncertainty of approximately 1.25 per cent have been derived. Of these equations the one with a physical basis gives an uncertainty of the difference between the air and the water data of 0.75 per cent. However, when modifications are made to the tappings to seek to determine the limitations of the equations, the data fit the equation which is less well founded physically further work is being undertaken to understand the phenomena observed.

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