A new measuring criterion of the performance of the electromagnetic flowmeter

Abstract EN

The weight function prescribing the sensitivity of the electromagnetic flowmeter (EMF) to the changes in the velocity profiles must be as much as possible uniformly distributed through the measuring volume.

The most common used criterion of the weight function distribution is a statistical quantity (ɛ criterion) which deals with only the axial component of the weight vector.

In the present work an attempt to introduce more revealing and accurate criterion to the EMF performance was studied.

The curl of the weight function vector over the measuring volume has been considered and formulated (and termed as ɛ C) in such a mathematical expression that takes into account the contributions of the three components of the weight vector regardless of the geometry of cross-sectional area of the flow.

In addition, a numerical solution of a previously defined criterion (ɛ ʎ) is presented here for a first time in order to compare the validity of the newly introduced criterion.

The results showed that the present new criterion ɛ c is closely harmonious with the previously defined criteria ɛ and ɛ ʎ in the conventional flow cases.

The results and the configuration of the formula of the present criterion which is independent of the flow cross-sectional are led us to conclude that is more reliable and applicable than other existing criteria.