A New empirical model for self-leveling behavior of cylindrical particle beds

円筒形容器内粒子ベッドのセルフ・レベリング挙動に関する新予測式

守田 幸路*; 松元 達也*; 西 津平*; 錦戸 達也*; Cheng, S.; 田上 浩孝 ; 鈴木 徹; 飛田 吉春

Morita, Koji*; Matsumoto, Tatsuya*; Nishi, Shimpei*; Nishikido, Tatsuya*; Cheng, S.; Tagami, Hirotaka; Suzuki, Toru; Tobita, Yoshiharu

In this study, a series of experiments using simulant materials were performed to develop an experimental database of self-leveling processes of particle beds in a cylindrical system. To simulate the coolant boiling in the beds in the experiments, a gas injection method was used to percolate nitrogen gas uniformly through the base of a bed with a conical-shaped mound. Time variations in bed height during the self-leveling process were measured for different particle sizes, densities and sphericities, and gas injection velocities. Using a dimensional analysis approach, a new model was proposed. This model correlates the experimental data on transient bed height with an empirical equation using a characteristic time for self-leveling development and an equilibrium bed height. The proposed model reasonably predicts the self-leveling development of particle beds.