MATHEMATICAL MODELLING OF SAMPLING FLOWMETERS

S. Walus

Abstract

Sampling flowmeters (called sometimes insertion flowmeters) are devices for measuring of flow-rate. The volume flow-rate is inferred on the base of the result of velocity measurement in certain point in the flow area. The two models of velocity distribution are introduced and for four possibilities of sensor placing in the pipe the formulas for distances of velocity sensor placing in the pipe are derived. The volume flow-rate is the product of measured local velocity, the flow area and the sensitivity factor. The formulae for sensitivity factor are derived for these four situations, and the volumetric flow-rate can be calculated. In conclusion are introduced some problems connected with volume flow-rate measurement with sampling flowmeter.

Keywords

sampling flowmeter, insertion flowmeter, non-intrusive flowmeter

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IMEKO-WC-2000-TC9-P251.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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