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Physical properties of core-concrete systems: Al2O3-ZrO2 molten materials measured by aerodynamic levitation

Ohishi, Yuji and Kargl, Florian and Nakamori, F and Muta, Hiroaki and Kurosaki, Ken and Yamanaka, Shinsuke (2017) Physical properties of core-concrete systems: Al2O3-ZrO2 molten materials measured by aerodynamic levitation. Journal of Nuclear Materials, 487, pp. 121-127. Elsevier. doi: 10.1016/j.jnucmat.2017.02.002. ISSN 0022-3115.

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Abstract

During a molten coreeconcrete interaction, molten oxides consisting of molten core materials (UO2 and ZrO2 ) and concrete (Al2O3, SiO2, CaO) are formed. Reliable data on the physical properties of the molten oxides will allow us to accurately predict the progression of a nuclear reactor core meltdown accident. In this study, the viscosities and densities of molten (ZrO2 )x(Al2O3)1-x (x = 0.356 and 0.172) were measured using an aerodynamic levitation technique. The densities of two small samples were estimated from their masses and their volumes (calculated from recorded images of the molten samples). The droplets were forced to oscillate using speakers, and their viscosities were evaluated from the damping behaviors of their oscillations. The results showed that the viscosity of molten (ZrO2)x(Al2O3)1-x compared to that of pure molten Al2O3 is 25% lower for x = 0.172, while it is unexpectedly 20% higher for x = 0.356.

Item URL in elib:https://elib.dlr.de/111272/
Document Type:Article
Title:Physical properties of core-concrete systems: Al2O3-ZrO2 molten materials measured by aerodynamic levitation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ohishi, YujiGraduate School of Engineering, Osaka University, JapanUNSPECIFIED
Kargl, Florianflorian.kargl (at) dlr.deUNSPECIFIED
Nakamori, FGraduate School of Engineering, Osaka University, JapanUNSPECIFIED
Muta, HiroakiGraduate School of Engineering, Osaka University, JapanUNSPECIFIED
Kurosaki, KenGraduate School of Engineering, Osaka University, JapanUNSPECIFIED
Yamanaka, ShinsukeGraduate School of Engineering, Osaka University, Japan, Research Institute of Nuclear Engineering, University of Fukui, JapanUNSPECIFIED
Date:3 February 2017
Journal or Publication Title:Journal of Nuclear Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:487
DOI :10.1016/j.jnucmat.2017.02.002
Page Range:pp. 121-127
Publisher:Elsevier
ISSN:0022-3115
Status:Published
Keywords:Molten coreeconcrete interaction Molten ZrO2-Al2O3 Aerodynamic levitation technique Viscosity Density
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials, R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kargl, Dr Florian
Deposited On:28 Feb 2017 07:27
Last Modified:06 Sep 2019 15:18

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