349 低エネルギー光反応による衝撃波発生に関する研究(T06-5 マイクロ・ナノ熱流体システム(5) 光・波動・振動,大会テーマセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In the microscale flow, shock wave that had very large pressure gradient is very available because of highly viscous. When we provided a highly concentrated energy in a small region by laser beam, an induced streaming, such as micro shock wave or laser induced thermal acoustic is observed in the region. In the present paper, a micro shock wave in air which was induced by laser irradiation was observed by the optical techniques. The induced shock wave is produced by the laser ablation of metal or gas breakdown due to the high density energy irradiation, whereas the present paper focused on a relatively low density energy domain. As the laser power decreasing, the plasma was not observed on the metal target but the micro shock was still induced. We compared the shape of shock wave and position of shock wave front as laser energy was changed. The shock Mach number was measured from the shadowgraphic images. The shock Mach number was compared with self-similar solution in the moderate range of laser irradiation.
社団法人日本機械学会の論文
2008-08-02