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  4. Laser-induced vaporisation of metal as a Riemann problem.
 
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1990
Journal Article
Title

Laser-induced vaporisation of metal as a Riemann problem.

Other Title
Laserinduziertes Verdampfen von Metall als ein Riemann Problem
Abstract
The process of vaporisation of a light-absorbing metal under laser irradiation will be investigated from a theoretical point of view. The tools are the Euler equations, the stationary heat-flow equation and the kinetic equations to calculate the gas dynamical properties of the edge of the Knudsen layer. Using the one-dimensional deflagration theory, it will be shown that the local sound velocity is an upper bound for the metal vapour velocity at the phase boundary. Furthermore it will be shown that for an absorbed intensity I sub a, which is greater than a certain threshold intensity I sub c, the vaporisation process is independent of the ambient gas. This intensity I sub c is calculated for aluminium and iron. On the assumption that a stationary limit of the vaporisation process is reached, the solution of the Euler equations is equivalent to the solution of a Riemann problem.
Author(s)
Aden, M.
Beyer, E.
Herziger, G.
Journal
Journal of Physics. D. Applied Physics  
DOI
10.1088/0022-3727/23/6/004
Language
English
Fraunhofer-Institut für Lasertechnik ILT  
Keyword(s)
  • absorption

  • aluminium

  • Eisen

  • Geschwindigkeit

  • iron

  • lichtabsorbierendes Metall

  • light-absorbing metal

  • Riemann Problem

  • vaporisation

  • velocity

  • Verdampfen

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