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The effect of conducting pipes on electromagnetic flowmeter sensitivity

An analytical expression obtained elsewhere for the change in virtual current due to conducting tubes at the ends of an electromagnetic flowmeter is used to determine corrections to the matrix representing the virtual current in a cutoff volume of the flowmeter interior. As described previously use of matrices to represent the virtual current and magnetic field provides an economical method for calculating electromagnetic flowmeter characteristics. Examples are given of calculated end effects under fully developed flow conditions using a configuration that models manufactured flow tubes. Reasonable agreement with end-effect calculations by another author for quasi-uniform magnetic fields is also demonstrated.