Experimental study of underwater rock drilling using a pulsed Ho:YAG laser-induced jets

被引：0

作者：

K. Ohtani

D. Numata

K. Takayama

T. Kobayashi

K. Okatsu

机构：

[1] Tohoku University,Shock Wave Interdisciplinary Application Division, Institute of Fluid Science

[2] Japan Drilling Co.,undefined

[3] Ltd,undefined

[4] Japan Oil,undefined

[5] Gas and Metals National Corporation,undefined

来源：

Shock Waves | 2009年 / 19卷

关键词：

Ho:YAG laser; Laser-induced liquid jet; Shock wave; Bubble; 42.62.-b; 47.40.Nm; 47.55.dd; 62.50.+p;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This paper is primarily an assessment of laser-induced water jets for boring rock surfaces. It also reports the result of preliminary experiments of pulsed Ho:YAG laser-induced jets applied to drill a submerged rock specimen. The irradiation of pulsed Ho:YAG laser beams at 3 Hz inside a thin metal tube produces intermittent water vapor bubbles which result in liquid jet discharge from the exit of the metal tube. The laser-induced water jets are visualized by shadowgraphs and images are recorded by a high-speed digital video camera. High stagnation pressures were eventually generated by the jet impingements. Simultaneously shock waves of about 22.7 MPa were generated at bubble collapse, which effectively cracked the surface of the rock specimens. Repeated exposures of these laser-induced jets against submerged rock specimens have a potential to practically bore holes on rock surfaces.

引用

页码：403 / 412

页数：9