Abstract
The present paper has investigated the momentum transport phenomena of underwater shock wave generation in terms of photo-acoustic wave with a very thin metal. The shock wave was induced by a pulsed-laser irradiation. In order to clarify the momentum transport mechanics in this phenomenon, we have been considered the momentum and energy transport from laser to metal, and metal to water. A numerical solution of thermo-elastic wave in metal has been obtained to estimate a fundamental gain of the longitudinal wave. Then, the underwater shock wave phenomena have been analyzed by adapting compressible fluid dynamics with suitable boundary condition between the solid and liquid. We had performed an experiment as well and observed the shock wave with optical system. The aim of the research is to estimate the underwater shock wave strength theoretically. The metal region was calculated by Laplace transformation of heat conduction and wave equations. The water region was simulated by MacCormack’s method. Some of boundary conditions have been examined and the acceleration condition has been adopted at the interface. The simulated results show a good agreement with experimental result, consequently the momentum transfer mechanism from longitudinal wave to underwater shock wave has been cleared in the present report.
Highlights
IntroductionLaser irradiation is one of the powerful candidates for supplying such high energy in short time
The present paper has investigated the momentum transport phenomena of underwater shock wave generation in terms of photo-acoustic wave with a very thin metal
The simulated results show a good agreement with experimental result, the momentum transfer mechanism from longitudinal wave to underwater shock wave has been cleared in the present report
Summary
Laser irradiation is one of the powerful candidates for supplying such high energy in short time. There are variety of laser processing work depending on laser power such as welding, drilling, melting etc. During those processes, shock waves frequently are generated by laser irradiation. The laser induced shock waves have been studied intensively in a wide field such as material processing, micro- and nano-technology, bio-engineering and medical science [1]-[3]. The dynamics of laser induced shock has been studied experimentally, theoretically and numerically aimed to examine the velocity, density, pressure rise around the shock wave for a specific application. A modeling of its transport phenomena is required to be completed in numerical simulation
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