|
Scientific Visualization
| Issue Year: | 2016 |
| Quarter: | 1 |
| Volume: | 8 |
| Number: | 1 |
| Pages: | 1 - 22 |
|
| Article Name: |
MODELING AND VISUALIZATION OF NANOSECOND LASER VAPORIZATION OF METALS IN NEAR CRITICAL REGION |
| Authors: |
V.I. Mazhukin (Russian Federation), A.A. Samokhin (Russian Federation), A.V. Shapranov (Russian Federation), M.M. Demin (Russian Federation), P.A. Pivovarov (Russian Federation) |
| Address: |
V.I. Mazhukin
vim@modhef.ru
Keldysh Institute of Applied Mathematics, RAS, Moscow, Russia
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
A.A. Samokhin
asam40@mail.ru
A.M. Prokhorov General Physics Institute, RAS, Moscow, Russia
A.V. Shapranov
Keldysh Institute of Applied Mathematics, RAS, Moscow, Russia
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
M.M. Demin
Keldysh Institute of Applied Mathematics, RAS, Moscow, Russia
P.A. Pivovarov
p_pivovvarov@hotmail.com
A.M. Prokhorov General Physics Institute, RAS, Moscow, Russia
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia |
| Abstract: |
Results and their visualizations are presented for the case of nanosecond laser ablation of a metal liquid film at different incident laser intensities G = 38.5, 44, 88 and 154 MW/cm2. The ablation of an Al film (thickness 430nm, initial particle number 5×105) including subcritical to supercritical states is investigated with the help of the classical molecular dynamic method and continual description of a conduction electron subsystem. Behavior of a thinner metal film (48nm) is also investigated at G = 29 MW/cm2 and G = 51 MW/cm2 (5 and 8,8 K/ps). 3D calculation results are given in the form of 2D particle distribution snapshots as well as temperature, density, pressure and particle velocity 1D distributions. As in the previously considered case of dielectric films for metal films four different ablation regimes are observed depending on the laser intensity: quasi-stationary surface evaporation, explosive (volume) boiling, spinodal decomposition and supercritical fluid expansion. Changes in space-time behavior of the density fluctuations in these regimes are clearly seen from the presented visualizations. Explosive boiling realization in metal ablation is not evident beforehand because of the high values of the thermal conductivity and absorption coefficients which can impede the manifestation of the process. Recoil pressure pulses that are caused by explosive boiling can be used as experimental markers of getting closer to the critical region while the critical region transition is characterized by the disappearance of the pressure pulsation. |
| Language: |
English |
|
|
|
