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首页> 外文会议>International Conference on Actual Issues of Mechanical Engineering >Study of Fast Relaxing Excitations Caused by Ultrashort Laser Pulses in Nanoscale Domain
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Study of Fast Relaxing Excitations Caused by Ultrashort Laser Pulses in Nanoscale Domain

机译：纳米级域外激光脉冲引起的快速松弛激发研究

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摘要

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.
机译：考虑到热流量和温度梯度的放松的热平衡方程和改进的傅立叶定律公式，用超短激光脉冲的板加热局部非平衡过程的模型，通过时间可变的第二级热流模型建模边界条件，开发了步骤（不连续）时间函数。该研究表明，不管激光辐射流强度如何，对非局部性的考虑导致延迟板换热。这一事实是通过培养基引起的阻力来解释其温度条件的变化过程，随着松弛因子的增长而增加。还显示，考虑到放松现象，可以立即不实现边界条件（第一，第二和第三类） - 它们可以仅在初始时间部分的明确范围内设置。因此，由于传热因子的值具有明确的极限，因此不可能立即实施边界条件，这取决于介质的弛豫特性，这可能在与介质的任何热交换条件下不超过的介质。给出了关系，其允许建立这种激光辐射流动变化模式，其随着时间的推移，壁面温度将保持和恒定。

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