Heat transfer mechanisms in thin film with laser heat source
Heat transfer mechanisms in thin film with laser heat source
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DOI：
10.1016/j.ijheatmasstransfer.2004.09.011
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发表时间：
2005
影响因子：
5.2
通讯作者：
S. Torii;Wen‐Jei Yang
中科院分区：
文献类型：
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作者：
S. Torii;Wen‐Jei Yang
本文研究了激光辐射对两侧对称加热的薄膜中热波传播现象的影响。脉冲激光加热被建模为具有各种时间特性的内部热源。Cattaneo热通量定律和能量守恒方程通过基于显式格式的数值技术求解，即，MacCormack的预测-校正方案结果得到的传热行为的时间历程之前和之后的对称碰撞的波前从两侧的膜。研究得出结论：（1）如果连续操作和脉冲激光热源的吸收系数增加，则在很短的时间内在很薄的膜中引起温度过冲，以及（2）热波的过冲和振荡取决于热源时间特性的频率。这种趋势在厚膜中变得较小。
The present study deals with the effect of laser radiation on the propagation phenomenon of a thermal wave in a very thin film subjected to a symmetrical heating on both sides. Pulsating laser heating is modelled as an internal heat source with various time characteristics. The Cattaneo heat flux law together with the energy conservation equation is solved by a numerical technique based on explicit scheme, i.e., MacCormack’s predictor–corrector scheme. Results are obtained for the time history of heat transfer behaviour before and after symmetrical collision of wave fronts from two sides of a film. The study concludes (1) if the absorption coefficient of the continuously-operated- and pulsating-laser heat source increases, temperature overshoot causes in a very thin film within a very short period of time, and (2) the overshoot and oscillation of thermal wave depend on the frequency of the heat source time characteristics. This trend becomes minor in a thick film.