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Title: Venturi Tubes: Improved Shape
Author: Michael Reader-Harris
Source: 2002 North Sea Flow Measurement Workshop
Year Published: 2002
Abstract: There is an increasing desire to use Venturi tubes for wet gas measurement, but to ensure accuracy in wet gas it is necessary to understand their behaviour in dry gas first. It was generally assumed until about seven years ago that the discharge coefficient at high Reynolds number in high-pressure gas would be constant and approximately equal to that obtained in water at Reynolds numbers greater than 2 105. However, work carried out at NEL reported by Jamieson et al 1, data reported by van Weers et al 2, and the papers on subsequent work at NEL 3-7 have shown that the performance of Venturi tubes in gas is very different from that in water. Some discharge coefficients in gas were greater than would have been expected by 3 per cent or even more. One factor which has an effect on how a Venturi tube performs is its internal shape. It is reasonable to consider the possibility that a profile with a smooth curve rather than sharp corners might be desirable. This paper therefore considers the performance of Venturi tubes of a range of profiles. Data were collected over the range of Reynolds numbers from about 105 to 107. The aim was to determine the best profile so that further work might provide a test of 4 Venturi tubes of the optimum profile.

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