MODELLING OF TRANSIT TIME ULTRASONIC FLOWMETERS IN THEORETICAL ASYMMETRIC FLOW

Pamela I. Moore, Gregor J. Brown, Brian P. Stimpson

Abstract

Velocity profile is the definition given to the distribution of velocity in the axial direction over the cross-section of the pipe. This distribution is not usually flat and can vary dramatically depending on the properties of the fluid and the configuration of the pipe in which it flows. Fully developed flow is well defined for most values of Reynolds number however distorted flow is not. Ultrasonic flowmeters are affected by such distortions in the flow profile often resulting in erroneous measurements. For this reason correction to or prediction of distorted profiles has sparked great interest in the design and application of ultrasonic flowmeters. Multi-path ultrasonic flowmeters are widely used in industry and many utilise a bounce-path technique. This document describes an analysis of the effect of theoretical asymmetric flow profiles on four transit time ultrasonic configurations utilising no more than two paths.

Keywords

ultrasonic flow measurement, transit time, asymmetric flow, installation effects, computational fluid dynamics

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IMEKO-TC9-2000-014.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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