Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-04-27
Abstract： [background] This study focuses on the phenomenon of bubbling in plate-type fuel assemblies within nuclear reactors. The study uses Fluent software for numerical simulation research and compares the differences between fission gas bubbles and solid bubbles, which have been previously studied. [Purpose] The purpose of the study is to investigate the effects of bubbling on temperature distribution, heat flux, and heat transfer capability in plate-type fuel assemblies. [Methods]The study employs Fluent software for numerical simulation to analyze the effects of both fission gas bubbles and solid bubbles on the thermal-hydraulic characteristics of plate-type fuel assemblies. [Results] The findings reveal that gas bubbles cause a local increase in temperature, with the heat flux around the bubbles tripling, though the overall heat flux of the fuel plate remains largely unchanged. The formation of bubbles locally enhances heat transfer capability by approximately 10%, with a 4% increase in heat flux on the bubble side. Under conditions of high flow rates, the presence of bubbles leads to a significant pressure difference across the fuel plate, causing deformation of the fuel plate and potentially leading to the blockage of the flow channel. [Conclusions] These discoveries provide significant references for the design and safety assessment of nuclear fuel plates, highlighting the importance of considering the effects of gas bubbling on thermal-hydraulic characteristics in the design and operation of nuclear reactors.
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-03-21
Abstract： [background] This study focuses on the phenomenon of bubbling in plate-type fuel assemblies within nuclear reactors. The study uses Fluent software for numerical simulation research and compares the differences between fission gas bubbles and solid bubbles, which have been previously studied. [Purpose] The purpose of the study is to investigate the effects of bubbling on temperature distribution, heat flux, and heat transfer capability in plate-type fuel assemblies. [Methods]The study employs Fluent software for numerical simulation to analyze the effects of both fission gas bubbles and solid bubbles on the thermal-hydraulic characteristics of plate-type fuel assemblies. [Results] The findings reveal that gas bubbles cause a local increase in temperature, with the heat flux around the bubbles tripling, though the overall heat flux of the fuel plate remains largely unchanged. The formation of bubbles locally enhances heat transfer capability by approximately 10%, with a 4% increase in heat flux on the bubble side. Under conditions of high flow rates, the presence of bubbles leads to a significant pressure difference across the fuel plate, causing deformation of the fuel plate and potentially leading to the blockage of the flow channel. [Conclusions] These discoveries provide significant references for the design and safety assessment of nuclear fuel plates, highlighting the importance of considering the effects of gas bubbling on thermal-hydraulic characteristics in the design and operation of nuclear reactors.
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