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A Methodological study extending an empirical model to predict self-leveling behavior of debris beds with non-spherical particles

非球形粒子からなるデブリベッドのセルフレベリング挙動を予測する経験的モデルを拡張するための方法論的枠組みの開発

Cheng, S.; 田上 浩孝; 山野 秀将; 鈴木 徹; 飛田 吉春; 中村 裕也*; Zhang, B.*; 松元 達也*; 守田 幸路*

Cheng, S.; Tagami, Hirotaka; Yamano, Hidemasa; Suzuki, Toru; Tobita, Yoshiharu; Nakamura, Yuya*; Zhang, B.*; Matsumoto, Tatsuya*; Morita, Koji*

In our previous publications, a simple empirical model, with its wide applicability confirmed over various experimental conditions, has been successfully proposed to predict the debris bed self-leveling behavior of spherical particles. Based on existing experimental knowledge obtained, in this study a methodological framework is developed with the purpose of extending its predicative capability for non-spherical particles. The proposed framework principally consists of two empirical terms - with one for correcting the terminal velocity of single non-spherical particles, which is the key parameter in our modeling, and the other for representing the additional particle-particle interactions caused by the shape-related parameters. Through the preliminary analyses, it was found that by linking the Geldart's method with our recently developed pressure-drop measurement facility, the terminal velocity of irregularly-shaped particles can be readily achieved, while for modeling the additional particle-particle interactions, based on the latest data available a parametric study is also conducted to identify the potential contributors.

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