Improved magnetic field for an electromagnetic flowmeter with point electrodes

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Abstract
The reading of an electromagnetic flowmeter usually depends on the velocity profile as well as on the total flow rate. A numerical method is given for designing the magnetic field so as to reduce this effect. Fluid velocity is assumed to be everywhere parallel to the axis of the flow tube but not necessarily axisymmetric. The results show that velocity profile effects can be greatly reduced. Details are given of an electromagnet designed to produce an improved magnetic field. In situations where flow is non-axisymmetric (e.g. near junctions) the maximum error expected in the reading of a flowmeter with the improved field is about 10% compared with about 50% for a conventional point electrode flowmeter. However, to achieve the same sensitivity about 25 times the power is required. The method of analysis is likely to lead to improvements in the design of both industrial and medical flowmeters.

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