Application of an eddy-current type flowmeter to void detection at the LMFBR core exit

Nakamoto, K.; Tamura, Shigeru; Ishii, Keiko; Kuwahara, Hiroshi; Ohyama, Noriaki; Muramatsu, Toshiharu

doi:10.1016/0029-5493(84)90224-3

Cited by 17 publications

(9 citation statements)

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“…2 However, experiments point out that the magnetic flux is strongly perturbed by a diluted bubbly flow and cannot be modeled by the Maxwell approach. 3,4 This result has been confirmed by numerical simulations. 5 Using the reciprocity theorem and an expansion of magnetic vector potential, Bowler et al have estimated the perturbation in impedance due to a single small defect in a conducting medium.…”

Section: Introductionsupporting

confidence: 64%

“…10,11 In the literature, a is generally defined as the relative flow rate of gas and not as the real volumic fraction, which is difficult to measure experimentally in liquid metal. 3,10,12 The effects of Lorentz and buoyancy forces on the deformation and the velocity of a single gas bubble rising in a liquid metal column are well described in the literature. Indeed, for static and rotating magnetic fields, experiments and numerical simulations point out that the hydrodynamic forces are modified by the Eddy current distribution around the bubble, which consequently affects the trajectory, the velocity, and the shape of the bubble.…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16][17][18][19][20] On the other hand, for AC magnetic fields at moderate frequencies for which induction is not negligible in the core of the flow, the effects of void on Eddy current distribution are not well explained. 3 In this paper, we present model experiments that show coupling effects between the Lorentz force and the Faraday induction on the Eddy current distribution in a model twophase liquid metal flow. In these experiments, we study the effects of velocity U, pulsation x, and the void fraction a at a) Electronic mail: philippe.tordjeman@imft.fr room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic flux distortion in two-phase liquid metal flow: Model experiment

Kumar

Bergez

Arinero

et al. 2016

Journal of Applied Physics

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In this paper, we present the model experiments in order to study the magnetic flux distortion of a two-phase liquid metal flow excited by an AC magnetic field in a range of pulsation where Faraday induction and Lorentz force effects are significant. These experiments realized with solid aluminum rods allow to characterize the effects of flow velocity (0 Շ U 1 ms À1 ), void fraction (0 a 6:9 %), pulsation of the AC magnetic field (1:5 Â 10 3 x 12:5 Â 10 3 rad s À1 ), and of two different void geometries. The results are analyzed on the basis of a first order expansion of magnetic flux in U and a. Despite the strong coupling between Faraday induction and Lorentz force effects, the results show that the contributions of U and a on a magnetic flux distortion can be well separated at both low magnetic Reynolds number and a values. These results are independent of void geometry.

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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic flux distortion in two-phase liquid metal flow: Model experiment

Kumar

Bergez

Arinero

et al. 2016

Journal of Applied Physics

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“…The probe is inserted into a 316 SS well which protects the probe from sodium. Nakamoto et al [5] found that the optimum excitation frequency was 375Hz for MK-3 Probe which is used for void detection in sodium flow.…”

Section: Construction and Working Principlementioning

confidence: 99%

An analysis on eddy current flowmeter — a review

Poornapushpakala

Gomathy

Sylvia

et al. 2010

Recent Advances in Space Technology Services and Climate Change 2010 (RSTS &Amp; CC-2010)

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Measurement of flow in liquid metal systems exhibit unusual problems because of the severe operating environments like high operating temperatures and the chemical reactivity of most liquid metals. The liquid metal flowmeters should have the capacity to withstand high gamma radiation levels and rapid thermal transients. The commonly used flowmeters in liquid metal systems are permanent magnet Flowmeter, direct current electromagnet Flowmeter and alternating current electromagnet flowmeter. In Alternating current electromagnet Flowmeter there are three types namely transverse field Flowmeter, Eddy Current Flowmeter and E-Core Flowmeter. The subject of analysis is the Eddy current Flowmeter. Eddy currents are generated when a moving conductor experiences changes in the magnetic field generated by a stationary object, as well as when a stationary conductor encounters a varying magnetic field. A flowmeter which works on this principle is the Eddy Current Flowmeter. This paper gives a thorough survey on eddy current flowmeter, its construction, simulation results and its performance under various test conditions in different organization

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“…Nakamoto et al [11] carried out phase sensitive synchronous detection at core exit in JOYO experimental fast reactor in 1984 using an ECFM in probe type configuration. They demonstrated that the device output voltage is proportional to void fraction from 0.1% up to 2%.…”

Section: Introductionmentioning

confidence: 99%

Towards Quantitative Void Fraction Measurement With an Eddy Current Flowmeter for Fourth Generation Sodium Cooled Fast Reactors: A Simplified Model

Kumar

Bergez

Cavaro

et al. 2016

IEEE Trans. Nucl. Sci.

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International audienceWe propose an experimental methodology for the purpose of quantitative void fraction measurements in fourth generation Sodium cooled fast reactors with a standard Eddy Current Flow Meter (ECFM) sensor. The methodology consists of using the technique of ellipse fit and correlate the fluctuations in the angle of inclination of this ellipse with the void fraction. This methodology is applied in this paper to an ideal configuration of periodic grooves on solid aluminium cylinder with various volumic fractions. The effects of physical parameters such as coil excitation frequency, coil current and motion have been studied. The first results show that ECFM is sensitive to void fractions between 0.3% and 6.9%. It further demonstrates that the response to void fraction is insensitive to the mean velocity of the two-phase medium

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Application of an eddy-current type flowmeter to void detection at the LMFBR core exit

Cited by 17 publications

References 1 publication

Magnetic flux distortion in two-phase liquid metal flow: Model experiment

Magnetic flux distortion in two-phase liquid metal flow: Model experiment

An analysis on eddy current flowmeter — a review

Towards Quantitative Void Fraction Measurement With an Eddy Current Flowmeter for Fourth Generation Sodium Cooled Fast Reactors: A Simplified Model

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Application of an eddy-current type flowmeter to void detection at the LMFBR core exit

Cited by 17 publications

References 1 publication

Magnetic flux distortion in two-phase liquid metal flow: Model experiment

Magnetic flux distortion in two-phase liquid metal flow: Model experiment

An analysis on eddy current flowmeter &#x2014; a review

Towards Quantitative Void Fraction Measurement With an Eddy Current Flowmeter for Fourth Generation Sodium Cooled Fast Reactors: A Simplified Model

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Product

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An analysis on eddy current flowmeter — a review