Analysis of Microwave Resonant Cavity Transducer Degradation Mechanisms

Carrel, Gabrielle; Heifetz, Alexander

doi:10.2172/1887267

Cited by 4 publications

(5 citation statements)

References 17 publications

(29 reference statements)

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“…We are developing a microwave cavity-based transducer as an alternative approach to hightemperature fluid flow measurements [7][8][9][10][11][12][13][14][15][16]. This transducer is a hollow metallic cavity fabricated from stainless steel, a material resilient to radiation, high temperature and corrosive environment of SFR and MSCR.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Microwave Cavity Transducer Performance in High Temperature Fluid Flow Sensing: Development of Microwave Cavity Flow Meter for Advanced Reactor High Temperature Fluids

Heifetz,

Fang,

Saniie

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Demonstration of Microwave Cavity Transducer Performance in High Temperature Fluid Flow Sensing: Development of Microwave Cavity Flow Meter for Advanced Reactor High Temperature Fluids

Heifetz,

Fang,

Saniie

et al. 2023

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“…For SS316, 𝑇 𝑚 ≈ 1400℃. Because in a low stress environment measurable observation of creep takes relatively long time, creep experiments on stainless steel 316 have been done in the medium-to-high stress and high temperature regime [15][16][17][18][19][20]. Results of these experiments can be extrapolated to predict creep in the low stress, high temperature regime.…”

Section: Creepmentioning

confidence: 99%

“…We are investigating a microwave cavity-based transducer for high-temperature fluid flow measurement for in-core sensing [7][8][9][10][11][12][13][14][15]. This transducer, described in details in Section 2, is a hollow metallic cavity, which can be fabricated from stainless steel, and as such is expected to be resilient to radiation, high temperature and corrosive environment of SFR and MSCR.…”

Section: Introductionmentioning

confidence: 99%

“…Computer simulations can offer a valuable insight in estimating material degradation and its impact on sensor deterioration. We have focused on modeling the effects of creep [15][16][17][18][19][20] and corrosion [15,[21][22][23][24][25] on degradation of the sensor's stainless steel 316 membrane in FLiBe (mixture of lithium fluoride and beryllium fluoride) salt. COMSOL multiphysics software was used to model the dynamic pressure on the flow sensor, the effects of creep, and the extent of chromium depletion as a proxy for the amount of corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Second Annual Report on Development of Microwave Resonant Cavity Transducer for Fluid Flow Sensing

Heifetz¹,

Carrel²,

Fang³

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Development of Microwave Resonant Cavity Transducer Recalibration Procedures

Heifetz,

Fang,

Saniie

et al. 2023

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We are investigating a microwave resonant cavity transducer for flow sensing in the vessel of a high temperature fluid advanced reactor (AR), such as a molten salt cooled reactor (MSCR) or a sodium fast reactor (SFR). This transducer is a hollow metallic cylindrical cavity, with one of the flat walls of the cylinder flexible enough to undergo microscopic deflection due to dynamic fluid pressure. Membrane deflection leads to a shift in the microwave resonant frequency, which can be detected with a spectrum analyzer.We have performed a preliminary proof-of-principle test of flow sensing in high temperature liquid sodium in environment. The liquid sodium setup consists of a cylindrical vessel with a center feed line, where a transducer inserted through the top cap of the vessel measures velocity of the impinging liquid jet. For this test, we have developed a cylindrical resonator, which was machined from stainless steel 316 and electroplated with silver on the interior surfaces. Inner diameter of the cylindrical cavity is 22.2 mm, and the thin wall is approximately 200µm thick. The cavity was excited through a WR-42 waveguide through a subwavelength hole on the side of the wall of the cylinder in the TE011 mode with resonant frequency f ≈ 17.8GHz. Sodium flow rate sensing study was performed in a liquid sodium vessel at 340 o C temperature and ambient pressure. The flow rate was changed by varying sodium pump power, and a frequency shift of several hundred KHz was observed.From the measurements, we observed significant scatter in high temperature liquid sodium at low flow velocity values. Our hypothesis is that this is caused by temperature drift in the liquid, which results in thermal expansion of the cavity and a drift in the resonator frequency. In this report, we investigate temperature dependence of the resonant frequency through development of analytic models and preliminary analysis of experimental data. In addition, we develop a procedure for compensation for temperature drift during flow sensing.

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Analysis of Microwave Resonant Cavity Transducer Degradation Mechanisms

Cited by 4 publications

References 17 publications

Demonstration of Microwave Cavity Transducer Performance in High Temperature Fluid Flow Sensing: Development of Microwave Cavity Flow Meter for Advanced Reactor High Temperature Fluids

Demonstration of Microwave Cavity Transducer Performance in High Temperature Fluid Flow Sensing: Development of Microwave Cavity Flow Meter for Advanced Reactor High Temperature Fluids

Second Annual Report on Development of Microwave Resonant Cavity Transducer for Fluid Flow Sensing

Development of Microwave Resonant Cavity Transducer Recalibration Procedures

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