Electromagnetic flowmeters and methods for measuring flow

Details Electromagnetic flowmeters and methods for measuring flow Electromagnetic flowmeters and methods for measuring flow

1980-04-04

1984-03-06

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 158

Patent

active

044346662

ABSTRACT:
An electromagnetic flowmeter for measuring the mean velocity of a fluid flowing through a duct is described. In one embodiment the electrodes are shaped to provide a uniform weighting function relating fluid velocity distribution over the duct cross section to flowmeter output voltage representative of mean velocity. Flowmeters are described in which using large insulated electrodes sensitivity is made independent of velocity profile by either ensuring that the applied magnetic field is uniform and the virtual current in the duct is two dimensional, or vice versa.

REFERENCES:
patent: 2733604 (1956-02-01), Coulter
patent: 3566686 (1971-03-01), Cushing
patent: 3589186 (1971-06-01), Bourg et al.
patent: 3759097 (1973-09-01), Cushing
patent: 3999443 (1976-12-01), Appel et al.
patent: 4050303 (1977-09-01), Hemp et al.
patent: 4098118 (1978-07-01), Schmoock
patent: 4308752 (1982-01-01), Appel et al.
"The Theory of Induced Voltage Electromagnetic Flowmeters", 1970 Journal Fluid Mech., vol. 43, Part 3, pp. 577-590.
"Long Induced Voltage Electromagnetic Flowmeters and the Effect of Velocity Profile", Bevir, Quart. Journ. of Mech. and Applied Math, vol. XX, Part 3, 1971, pp. 347-372.
"Electromagnetic Flowmeters", Baker Lecture 13A in 1977, Course Entitled The Principles and Practice of Flow Measurement.
"Improved Magnetic Field for an Electromagnetic Flowmeter with Point Electrodes", Hemp, J. Phys. D: Appl. Phys., vol. 8, 1975, pp. 983-1002.

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