Development and feasibility demonstration of a capacitance-based sensor for liquid film thickness measurement on a heated rod surface under falling-film conditions.
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| Title: | Development and feasibility demonstration of a capacitance-based sensor for liquid film thickness measurement on a heated rod surface under falling-film conditions. |
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| Authors: | Ueda, S.1 (AUTHOR) ueda3745@criepi.denken.or.jp, Arai, T.1 (AUTHOR) t-arai@criepi.denken.or.jp, Furuya, M.1 (AUTHOR) furuya@criepi.denken.or.jp |
| Source: | Nuclear Engineering & Design. Sep2026, Vol. 456, pN.PAG-N.PAG. 1p. |
| Subjects: | Capacitive sensors, Film flow, Nucleate boiling, Heat transfer, Nuclear fuels, Nuclear fuel rods |
| Abstract: | The distribution of liquid film thickness on heat transfer surfaces in fuel assemblies of light water reactors is a critical factor in heat transfer performance. Therefore, developing sensors capable of multipoint measurements in such complex flow paths is essential. A capacitance-based liquid film sensor was designed to measure the liquid film thickness in boiling flow within a rod bundle simulating a nuclear fuel assembly, without disturbing the liquid film. The proposed method evaluates liquid film thickness by measuring capacitance between a rod electrode, simulating a fuel rod in the rod bundle flow path, and a wire strung inside the flow path as a measurement electrode. The key innovation of this study lies in applying the capacitance-based measurement concept to a rod bundle geometry. A demonstrative experiment was conducted in an air-water falling liquid film flow, comparing results from the developed sensor with those from a laser focus displacement meter. To facilitate future integration into a rod bundle, a part of the sensor was fabricated using a single rod and wire electrode, and its operating principle and performance were examined. Furthermore, liquid film thicknesses on both unheated and heated rods were measured under identical flow conditions, demonstrating that the developed sensor is also capable of measuring liquid film thickness on a heated rod. • A capacitance-based sensor measures the liquid film thickness on a heated heater rod surface. • The sensor enables non-intrusive, multipoint film measurement in complex high-temperature, high-pressure rod bundles. • Experimental validation shows consistency with laser focus displacement meter data. • The sensor accurately measures liquid film thickness on both heated and unheated rods. • Findings expand multidimensional measurement options in simulated nuclear fuel assemblies and thermal-hydraulic tests. [ABSTRACT FROM AUTHOR] |
| Copyright of Nuclear Engineering & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194425103 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Development and feasibility demonstration of a capacitance-based sensor for liquid film thickness measurement on a heated rod surface under falling-film conditions. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ueda%2C+S%2E%22">Ueda, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ueda3745@criepi.denken.or.jp</i><br /><searchLink fieldCode="AR" term="%22Arai%2C+T%2E%22">Arai, T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> t-arai@criepi.denken.or.jp</i><br /><searchLink fieldCode="AR" term="%22Furuya%2C+M%2E%22">Furuya, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> furuya@criepi.denken.or.jp</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nuclear+Engineering+%26+Design%22">Nuclear Engineering & Design</searchLink>. Sep2026, Vol. 456, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Capacitive+sensors%22">Capacitive sensors</searchLink><br /><searchLink fieldCode="DE" term="%22Film+flow%22">Film flow</searchLink><br /><searchLink fieldCode="DE" term="%22Nucleate+boiling%22">Nucleate boiling</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+fuels%22">Nuclear fuels</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+fuel+rods%22">Nuclear fuel rods</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The distribution of liquid film thickness on heat transfer surfaces in fuel assemblies of light water reactors is a critical factor in heat transfer performance. Therefore, developing sensors capable of multipoint measurements in such complex flow paths is essential. A capacitance-based liquid film sensor was designed to measure the liquid film thickness in boiling flow within a rod bundle simulating a nuclear fuel assembly, without disturbing the liquid film. The proposed method evaluates liquid film thickness by measuring capacitance between a rod electrode, simulating a fuel rod in the rod bundle flow path, and a wire strung inside the flow path as a measurement electrode. The key innovation of this study lies in applying the capacitance-based measurement concept to a rod bundle geometry. A demonstrative experiment was conducted in an air-water falling liquid film flow, comparing results from the developed sensor with those from a laser focus displacement meter. To facilitate future integration into a rod bundle, a part of the sensor was fabricated using a single rod and wire electrode, and its operating principle and performance were examined. Furthermore, liquid film thicknesses on both unheated and heated rods were measured under identical flow conditions, demonstrating that the developed sensor is also capable of measuring liquid film thickness on a heated rod. • A capacitance-based sensor measures the liquid film thickness on a heated heater rod surface. • The sensor enables non-intrusive, multipoint film measurement in complex high-temperature, high-pressure rod bundles. • Experimental validation shows consistency with laser focus displacement meter data. • The sensor accurately measures liquid film thickness on both heated and unheated rods. • Findings expand multidimensional measurement options in simulated nuclear fuel assemblies and thermal-hydraulic tests. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nuclear Engineering & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.nucengdes.2026.115021 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Capacitive sensors Type: general – SubjectFull: Film flow Type: general – SubjectFull: Nucleate boiling Type: general – SubjectFull: Heat transfer Type: general – SubjectFull: Nuclear fuels Type: general – SubjectFull: Nuclear fuel rods Type: general Titles: – TitleFull: Development and feasibility demonstration of a capacitance-based sensor for liquid film thickness measurement on a heated rod surface under falling-film conditions. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ueda, S. – PersonEntity: Name: NameFull: Arai, T. – PersonEntity: Name: NameFull: Furuya, M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00295493 Numbering: – Type: volume Value: 456 Titles: – TitleFull: Nuclear Engineering & Design Type: main |
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