Discharge Coefficient for Venturi Flowmeter With Short Laying Length

[+] Author and Article Information
Masahiro Inoue

Department of Mechanical Engineering, Power Division, Kyushu University, Fukuoka, Japan

J. Fluids Eng 104(4), 463-467 (Dec 01, 1982) (5 pages) doi:10.1115/1.3241882 History: Received September 01, 1979; Online October 26, 2009


This paper presents a method for predicting the discharge coeffcient for a venturi flowmeter with a short laying length where the static pressure is not uniform at the throat due to streamline curvature. The discharge coefficient is determined by combining potential flow calculations and one-dimensional viscous flow considerations. For the potential flow, an accurate computational technique proposed by the author is used to calculate the pressure at the throat tap by assuming that the total pressure is equal to the average one at the throat. The average total pressure is related to the inlet pressure by use of a generalized empirical equation based on one-dimensional considerations. Validity of the method is verified by comparison with published experimental data for short venturi flowmeters.

Copyright © 1982 by ASME
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