This work pioneers the atomistic modeling of the shock wave in picosecond laser-material interaction by simulating the material that is irradiated with a picosecond laser pulse (11.3 ps FWHM) in a 0.25 MPa background gas. The dynamic structure and mutual mass penetration between the plume and background gas are investigated in detail. In the shock wave the compressed ambient gas region has a very uniform temperature distribution while the temperature decreases from the front of the plume to its end. The group velocity of atoms in the shock wave front is much smaller than the shock wave propagation speed and experiences a fast decay due to momentum exchange with the ambient gas. Strong decay of the shock wave front temperature and pressure is observed while its density features much slower attenuation. An effective mixing length is designed to quantitatively evaluate the mutual mass penetration between the plume and background gas. This effective mixing length grows at a rate of ∼ 60 m/s. This fast mixing/mass penetration is largely due to the strong relative movement between the plume and the background gas. The MD results agree well with the analytical solution in terms of relating various shock wave strengths.
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ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer
June 6–9, 2008
Tainan, Taiwan
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4292-4
PROCEEDINGS PAPER
Shock Waves in Pulsed Laser Material Interaction: Internal Structure and Mass Penetration Available to Purchase
Lijun Zhang,
Lijun Zhang
University of Nebraska at Lincoln, Lincoln, NE
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Xinwei Wang
Xinwei Wang
University of Nebraska at Lincoln, Lincoln, NE
Search for other works by this author on:
Lijun Zhang
University of Nebraska at Lincoln, Lincoln, NE
Xinwei Wang
University of Nebraska at Lincoln, Lincoln, NE
Paper No:
MNHT2008-52121, pp. 25-30; 6 pages
Published Online:
June 22, 2009
Citation
Zhang, L, & Wang, X. "Shock Waves in Pulsed Laser Material Interaction: Internal Structure and Mass Penetration." Proceedings of the ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B. Tainan, Taiwan. June 6–9, 2008. pp. 25-30. ASME. https://doi.org/10.1115/MNHT2008-52121
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