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Calibrationless rotating Lorentz-force flowmeters for low flow rate applications

Author(s): Hvasta, MG; Dudt, D; Fisher, AE; Kolemen, Egemen

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Abstract: A 'weighted magnetic bearing' has been developed to improve the performance of rotating Lorentz-force flowmeters (RLFFs). Experiments have shown that the new bearing reduces frictional losses within a double-sided, disc-style RLFF to negligible levels. Operating such an RLFF under 'frictionless' conditions provides two major benefits. First, the steady-state velocity of the RLFF magnets matches the average velocity of the flowing liquid at low flow rates. This enables an RLFF to make accurate volumetric flow measurements without any calibration or prior knowledge of the fluid properties. Second, due to minimized frictional losses, an RLFF is able to measure low flow rates that cannot be detected when conventional, high-friction bearings are used. This paper provides a brief background on RLFFs, gives a detailed description of weighted magnetic bearings, and compares experimental RLFF data to measurements taken with a commercially available flowmeter.
Publication Date: 2018
Citation: Hvasta, MG, Dudt, D, Fisher, AE, Kolemen, E. (2018). Calibrationless rotating Lorentz-force flowmeters for low flow rate applications. Measurement Science and Technology, 29 (10.1088/1361-6501/aac3b5
DOI: doi:10.1088/1361-6501/aac3b5
Type of Material: Journal Article
Journal/Proceeding Title: Measurement Science and Technology
Version: Author's manuscript

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