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Wen, J.*; 鎌田 悠斗*; 横山 貢成*; 松元 達也*; Liu, W.*; 守田 幸路*; 今泉 悠也; 田上 浩孝; 松場 賢一; 神山 健司
Proceedings of 13th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS13) (Internet), 8 Pages, 2024/11
The influence of water pool height, particles diameter and wall cooling on particle bed-water pool heat transfer was evaluated by assessing the time variation of average temperatures of the particle bed and water pool, and their difference. The concept of macroscopic heat transfer coefficient of the particle bed-water pool system was introduced to elucidate the intensity of natural convection. The results show that the time variation of temperature difference initially increases, peaks, and then decreases. Based on this phenomenon, the process of heat transfer of the particles bed-water pool system was explained. According to the result, the water pool height and particle diameter will affect the heat transfer, but the current cooling conditions have little influence on the heat transfer of the particle bed.
Wen, J.*; 鎌田 悠斗*; 横山 貢成*; 松元 達也*; Liu, W.*; 守田 幸路*; 今泉 悠也; 田上 浩孝; 松場 賢一; 神山 健司
Proceedings of 31st International Conference on Nuclear Engineering (ICONE31) (Internet), 8 Pages, 2024/11
To investigate the coolability of fuel debris bed immersed in molten steel, a rectangular experimental system was built in which the particle bed was volumetrically heated via direct current heating. The experimental apparatus consists of a particle bed immersed in water and a water pool above it, which simulate disrupted solid fuel and molten steel, respectively. Computer code simulations with reactor safety analysis code SIMMER-IV were performed to help understanding the heat transfer characteristics and to validate the applicability of the newly embedded momentum exchange function (MXF) models. Under the current experimental conditions, some key parameters like the particle bed average temperature, water pool average temperature, and temperature difference between the bed and the pool were evaluated to compare with the simulation results. The comparison results showed the most applicable MXF model under the current experimental conditions, and the analysis with it well reproduced the phenomena which was observed in the experiments.
Wen, J.*; 鎌田 悠斗*; 横山 貢成*; 松元 達也*; Liu, W.*; 守田 幸路*; 今泉 悠也; 田上 浩孝; 松場 賢一; 神山 健司
no journal, ,
An Experimental investigation on the heat transfer behavior of spherical particle bed with volumetric heating was carried out to verify the newly embedded momentum exchange function (MXF) models in SIMMER-IV code. The experimental apparatus consists of a particle bed immersed in water and a water pool above it, which simulate disrupted solid fuel and molten steel, respectively. Correspondent SIMMER-IV model was built to verify the newly embedded MXF models compared to the experiments. The results show that Syamlal's model has better consistency of experiments than other models under the current experimental conditions.
