Method and flowmeter for unsteady fluid flow study

Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties

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7386112, G01F 160

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active

053076885

ABSTRACT:
An electromagnetic flowmeter and a method for measurement of the rate of flow of a fluid under unsteady conditions are described. It uses fluid steady-state flowmeter technology and a new algorithm to measure transient rate of flow of a fluid such as water. The algorithm teaches (a) measuring the e.m.f. generated due to the rate of flow of the fluid under test moving through a tube placed in an area with uniform magnetic flux, and (b) comparing it to a simultaneously generated reference signal which is measure of the magnetic flux density generated when an electromagnetic flowmeter is energized due to the fluid flow rate at the instant of taking the flow rate data of the fluid.

REFERENCES:
patent: 3380301 (1968-04-01), Mannherz et al.
patent: 4169375 (1979-10-01), Suzuki
patent: 4193298 (1980-03-01), Kayama et al.
patent: 4300401 (1981-11-01), Pedersen
patent: 4417479 (1983-11-01), Schmoock et al.
patent: 4459857 (1984-07-01), Murray et al.
Durgin, William & Paul Lefebvre, A Transient Electromagnetic Flowmeter & ibration Facility; Journal of Fluids Engineering vol. 112, pp. 12-15, Mar. 1990.

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