Entrainment of water around a single rod immersed in water pool with gas jet impingement

単一円管に衝突するガスジェットによる水の巻き込みに関する現象解明

曽我 和生*; 新倉 英人*; 杉山 憲一郎*; 奈良林 直*; 大島 宏之; 須田 一則 

Soga, Kazuo*; Niikura, Hideto*; Sugiyama, Kenichiro*; Narabayashi, Tadashi*; Ohshima, Hiroyuki; Suda, Kazunori

Na-水反応現象における水蒸気ジェットの挙動を理解する基礎研究として、水中に設置した単一水平円筒へArガスジェットを噴出させる可視化実験を実施し、化学反応がないジェット体系におけるガスジェットと周囲水との混合挙動を明らかにした。

A series of experiments that investigate the entrainment process of ambient liquid toward jet interior are carried out by using a laser-sheet visualization and a void meter in water pool in the present work. It was observed that the entrainment of water into Ar gas jet is constantly caused in two regions just above the nozzle and just below the single rod. In the region just above the nozzle, negative pressure causes the entrainment of water. In the region below the rod, the entrainment of water is caused because the preceding Ar gas jet is caught up by the succeeding gas jet. The basic behavior of Ar gas jet causing the entrainment of water was confirmed to be almost same over the Reynolds number range of Ar gas jet, 2.17103 to 2.17104, in the present study.