Study on the Quench Behaviour of Molten Fuel Material Jetted into Coolant

Abe, Yutaka; Kizu, Tetsuya; Nariai, Hideki; Chitose, Keiko; Koyama, Kazuya

doi:10.1299/kikaib.71.947

Cited by 3 publications

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“…According to previous work, the fragment size is affected by classical instabilities (Abe et al, 2004(Abe et al, , 2005(Abe et al, , 2006Bang et al, 2003;Matsuo et al, 2008). The relationship between the evaluated droplet size and the critical wavelength of each instability is compared here.…”

Section: Comparison With Classical Hydrodynamic Instabilitiesmentioning

confidence: 98%

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Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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To better understand the fundamental interactions between melt jet and coolant during a coredisruptive accident at a sodium-cooled fast reactor, the jet breakup and droplet formation in immiscible liquid-liquid systems were studied experimentally. Experiments using two different pairs of test fluids were carried out at isothermal conditions. The observed jet breakup behavior was classified into characteristic regimes based on the classical Ohnesorge classification in liquid-gas systems. The variation in breakup length obtained in the present liquid-liquid system was similar to that in a liquidgas system. The droplet size distribution in each breakup regime was analyzed using image processing and droplet formation via pinch-off, satellite formation, and entrainment was observed. The measured droplet size was compared with those available from melt jet experiments. Based on the observation and analysis results, the breakup regimes were organized on a dimensionless operating diagram, with the derived correlations representing the criteria for regime boundaries of a liquid-liquid system. Finally, the experimental data were extrapolated to the expected conditions of a sodium-cooled fast reactor. From this, it was implied that most of the hydrodynamic conditions during an accident would be close to the atomization regime, in which entrainment is the dominant process for droplet formation. Nomenclature d droplet diameter Dj0 nozzle diameter

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Section: Comparison With Classical Hydrodynamic Instabilitiesmentioning

confidence: 98%

“…The conditions for the appearance of atomized breakup in liquid-liquid systems is an issue that is yet to be clarified. Identifying those conditions would enables us to use a simplified physical model to predict breakup length and fragment diameter and hence be able to evaluate melt coolability (e.g., Abe et al, 2005Abe et al, , 2006.…”

Section: Introductionmentioning

confidence: 99%

Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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Melt jet-breakup and fragmentation phenomena in nuclear reactors: A review of experimental works and solidification effects

Iwasawa

Abe

2018

Progress in Nuclear Energy

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Visualization and measurement of jet breakup behavior using LIF

Saito

Abe

Koyama³

2015

Transactions of the JSME (In Japanese)

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This paper presents a detailed experimental study to understand the fundamental process of jet breakup during a core disruptive accident of a sodium-cooled fast reactor. The study mainly focuses on hydrodynamic interaction of jet breakup and fragmentation behavior. The experiments were carried out in an immiscible liquid-liquid system. The indices of refraction in the two liquids were matched, so that the vertical plane of jet flow was clearly visualized using laser-induced fluorescence (LIF). The jet breakup length obtained by image processing is compared with the existing correlations. The applicability of the jet breakup length correlations is discussed from the viewpoints of Weber number and film-boiling effect. When the Weber number is from 10 to 1000, and the boiling effect is small enough, it is suggested that jet breakup length is described by Epstein's correlation. Finally, the reduction of jet core diameter is investigated. It is shown, in this experiment, that the mean jet diameter reduces in the flow direction gradually, but it does not reduce linearly.

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Study on the Quench Behaviour of Molten Fuel Material Jetted into Coolant

Cited by 3 publications

References 0 publications

Flow transition criteria of a liquid jet into a liquid pool

Flow transition criteria of a liquid jet into a liquid pool

Melt jet-breakup and fragmentation phenomena in nuclear reactors: A review of experimental works and solidification effects

Visualization and measurement of jet breakup behavior using LIF

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