Study of Fast Relaxing Excitations Caused by Ultrashort Laser Pulses in Nanoscale Domain

DOI

10.2991/aime-17.2017.34How to use a DOI?

Keywords

Heat conduction boundary problem, local non-equilibrium heat exchange, relaxation factor, time-variable heat flow, numerical solution, analytical solution

Abstract

By using the heat balance equation and a modified Fourier law's formula considering the relaxation of heat flow and temperature gradient, a model of the local non-equilibrium process of plate heating with ultrashort laser pulses, modelled by heat flow of time-variable second-class boundary conditions, step (discontinuous) time function, was developed. The research showed that consideration of non-locality results in the delayed plate heatup irrespective of the laser radiation flow intensity. This fact is explained by the resistance caused by the medium to the process of change of its temperature condition, which increases as the relaxation factor grows. It was also shown that in consideration of the relaxation phenomena, the boundary conditions (first-, second- and third-class) may not be fulfilled immediately - they may be set only within a definite range of the initial time section. Therefore, the immediate implementation of the boundary condition is impossible since the value of the heat transfer factor has a definite limit, depending on the relaxation properties of the medium, which may not be exceeded under any conditions of heat exchange with the medium. The relations are given which allow establishing such laser radiation flow change patterns at which the wall surface temperature would remain set and constant over time

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - A.V. Eremin
AU  - K.V. Trubitsyn
AU  - I.V. Kudinov
AU  - V.A. Kudinov
AU  - V.K. Tkachev
AU  - E.V. Stefanyuk
PY  - 2017/07
DA  - 2017/07
TI  - Study of Fast Relaxing Excitations Caused by Ultrashort Laser Pulses in Nanoscale Domain
BT  - Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)
PB  - Atlantis Press
SP  - 202
EP  - 208
SN  - 2352-5401
UR  - https://doi.org/10.2991/aime-17.2017.34
DO  - 10.2991/aime-17.2017.34
ID  - Eremin2017/07
ER  -