Development of prediction technology of two-phase flow dynamics under earthquake acceleration, 16; Experimental and numerical study of pressure fluctuation effects on bubble motion

地震加速度付加時の二相流挙動に対する予測技術の開発,16; 気泡挙動に及ぼす圧力変動の影響に関する実験及び解析的検討

加藤 由幹; 吉田 啓之  ; 横山 諒太郎*; 金川 哲也*; 金子 暁子*; 文字 秀明*; 阿部 豊*

Kato, Yuki; Yoshida, Hiroyuki; Yokoyama, Ryotaro*; Kanagawa, Tetsuya*; Kaneko, Akiko*; Monji, Hideaki*; Abe, Yutaka*

In this study, visualization experiment for the bubbly flow in a horizontal pipe excited by oscillation acceleration was performed to understand bubbly flow behavior under earthquake acceleration. Liquid pressure was also measured at upstream and downstream of the test section. In addition, to consider detailed effects of pressure gradient on bubble motion, numerical simulation of two-phase flow in horizontal pipe with vibration was performed by a detailed two-phase flow simulation code with an advanced interface tracking method: TPFIT. Based on observed images and calculated results, bubble velocity was evaluated. It was confirmed that the pressure gradient amplitude increased with the increase of the frequency of the table. In addition, it was observed that the bubble velocity amplitude also increases with the increase of the frequency of the table. It was concluded that the bubble motion was strongly affected by the pressure gradient in the test section.