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Title: Calibrationless rotating Lorentz-force flowmeters for low flow rate applications

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. As a result, 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1459562
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Measurement Science and Technology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 7; Journal ID: ISSN 0957-0233
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; low-friction bearings; Lorentz-force velocimetry; flowmeter; liquid metal

Citation Formats

Hvasta, M. G., Dudt, D., Fisher, A. E., and Kolemen, E. Calibrationless rotating Lorentz-force flowmeters for low flow rate applications. United States: N. p., 2018. Web. https://doi.org/10.1088/1361-6501/aac3b5.
Hvasta, M. G., Dudt, D., Fisher, A. E., & Kolemen, E. Calibrationless rotating Lorentz-force flowmeters for low flow rate applications. United States. https://doi.org/10.1088/1361-6501/aac3b5
Hvasta, M. G., Dudt, D., Fisher, A. E., and Kolemen, E. Tue . "Calibrationless rotating Lorentz-force flowmeters for low flow rate applications". United States. https://doi.org/10.1088/1361-6501/aac3b5. https://www.osti.gov/servlets/purl/1459562.
@article{osti_1459562,
title = {Calibrationless rotating Lorentz-force flowmeters for low flow rate applications},
author = {Hvasta, M. G. and Dudt, D. and Fisher, A. E. and Kolemen, E.},
abstractNote = {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. As a result, 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.},
doi = {10.1088/1361-6501/aac3b5},
journal = {Measurement Science and Technology},
number = 7,
volume = 29,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: A depiction of a rotating Lorentz-force flowmeter. In the ‘side view’, the flow is directed out of the page.

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    Works referencing / citing this record:

    Liquid Metal Diagnostics
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