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The theory of induced voltage electromagnetic flowmeters

Published online by Cambridge University Press:  29 March 2006

M. K. Bevir
M. K. Bevir
Affiliation:
The University of Warwick Present address: The Nuffield Institute for Medical Research, Oxford.
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Abstract

The performance of an electromagnetic flowmeter head is assessed in terms of a weight vector W such that the output voltage ∝ ∫ v. Wdτ, where v is the velocity and τ the flowmeter volume. The condition curl W = 0 with W → 0 at ∞ is shown to be necessary and sufficient for the velocity to depend only on the flow rate and not on the flow pattern. A class of such ‘ideal’ meters is described. It is shown that meters with point electrodes can never be ideal but may, with considerable complication of the magnetic field, be made immune to asymmetric velocity-profile variations if the flow is rectilinear.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 43 , Issue 3 , 16 September 1970 , pp. 577 - 590
Copyright
© 1970 Cambridge University Press

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