Optical fibre void fraction detection for liquid metal fast neutron reactors

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@article{40b3e1e3538d4dff95320f0d3a391621,
title = "Optical fibre void fraction detection for liquid metal fast neutron reactors",
abstract = "Detection and characterisation of voids in heavy liquid metals (HLM) is required for next generation nuclear reactor systems. However, its determination presents a challenge owing to their opaque nature and the high temperatures involved. Therefore, tools are needed that can be used to capture local, quantitative information at relevant nuclear operating conditions. In this work, the feasibility of using optical fibre sensors for the measurement of void fractions in liquid metals is presented. Since the functioning of optical probes is usually explained by a crude on-off model, the complexity of both the optical response and the hydrodynamic tip–interface interactions often remain hidden to new users. To clarify this point, well-controlled lab-scale experiments dealing with the response of three concept probe tip geometries are presented. Analysis of the obtained signal transients is used to provide guidelines for effective data processing. To conclusively demonstrate the principle, an optimal prototype system successfully determined the local void fraction and frequency in a pilot-scale reactor using liquid lead bismuth eutectic (LBE) as working fluid. The information obtained by the optical sensor allows for validation of computational fluid dynamics (CFD) models to aid the design of LBE-based nuclear reactors, as well as for other liquid metal–gas systems in general.",
keywords = "Optical fibre sensors, Liquid metals, Multiphase reactors, Void fraction, Lead bismuth eutectic (LBE)",
author = "Christophe Corazza and Kris Rosseel and Willem Leysen and Kristof Gladinez and Alessandro Marino and Jun Lim and Alexander Aerts",
note = "Score=10",
year = "2020",
month = "5",
doi = "10.1016/j.expthermflusci.2019.109865",
language = "English",
journal = "Experimental Thermal and Fluid Science",
issn = "0894-1777",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Optical fibre void fraction detection for liquid metal fast neutron reactors

AU - Corazza, Christophe

AU - Rosseel, Kris

AU - Leysen, Willem

AU - Gladinez, Kristof

AU - Marino, Alessandro

AU - Lim, Jun

AU - Aerts, Alexander

N1 - Score=10

PY - 2020/5

Y1 - 2020/5

N2 - Detection and characterisation of voids in heavy liquid metals (HLM) is required for next generation nuclear reactor systems. However, its determination presents a challenge owing to their opaque nature and the high temperatures involved. Therefore, tools are needed that can be used to capture local, quantitative information at relevant nuclear operating conditions. In this work, the feasibility of using optical fibre sensors for the measurement of void fractions in liquid metals is presented. Since the functioning of optical probes is usually explained by a crude on-off model, the complexity of both the optical response and the hydrodynamic tip–interface interactions often remain hidden to new users. To clarify this point, well-controlled lab-scale experiments dealing with the response of three concept probe tip geometries are presented. Analysis of the obtained signal transients is used to provide guidelines for effective data processing. To conclusively demonstrate the principle, an optimal prototype system successfully determined the local void fraction and frequency in a pilot-scale reactor using liquid lead bismuth eutectic (LBE) as working fluid. The information obtained by the optical sensor allows for validation of computational fluid dynamics (CFD) models to aid the design of LBE-based nuclear reactors, as well as for other liquid metal–gas systems in general.

AB - Detection and characterisation of voids in heavy liquid metals (HLM) is required for next generation nuclear reactor systems. However, its determination presents a challenge owing to their opaque nature and the high temperatures involved. Therefore, tools are needed that can be used to capture local, quantitative information at relevant nuclear operating conditions. In this work, the feasibility of using optical fibre sensors for the measurement of void fractions in liquid metals is presented. Since the functioning of optical probes is usually explained by a crude on-off model, the complexity of both the optical response and the hydrodynamic tip–interface interactions often remain hidden to new users. To clarify this point, well-controlled lab-scale experiments dealing with the response of three concept probe tip geometries are presented. Analysis of the obtained signal transients is used to provide guidelines for effective data processing. To conclusively demonstrate the principle, an optimal prototype system successfully determined the local void fraction and frequency in a pilot-scale reactor using liquid lead bismuth eutectic (LBE) as working fluid. The information obtained by the optical sensor allows for validation of computational fluid dynamics (CFD) models to aid the design of LBE-based nuclear reactors, as well as for other liquid metal–gas systems in general.

KW - Optical fibre sensors

KW - Liquid metals

KW - Multiphase reactors

KW - Void fraction

KW - Lead bismuth eutectic (LBE)

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34886920

U2 - 10.1016/j.expthermflusci.2019.109865

DO - 10.1016/j.expthermflusci.2019.109865

M3 - Article

JO - Experimental Thermal and Fluid Science

JF - Experimental Thermal and Fluid Science

SN - 0894-1777

M1 - 109865

ER -

ID: 5441809