激光点热源作用下试件内部热传导的实验研究

Experimental Investigation of Heat Transfer in the Limit Thickness Samples Under Laser Point Source Irradiation

通过红外热像仪测温装置,对有限厚度试件在激光点热源作用下热作用区侧面温度分布进行实时测量。结果表明:对于小厚度的试件,材料内部温度分布与用傅立叶定律得到的结果完全相反,材料内部的温度高于边界温度。对比短脉冲激光作用下产生非傅立叶效应的条件,它们之间有很大差异,由此提出将实验中出现的非常规现象定义为泛傅立叶效应,认为它是由于热量传播到边界时发生反射、叠加等波动行为所致。

The temperature distribution of the limit thickness specimen on the lateral area of the heated region under laser point source irradiation was measured with the thermovision infrared system. Experimental results is contrary to the results calculated by Fourier law. Inner temperature of the specimen is higher than boundary temperature. There is a world of difference compared with the condition of non-Fourier effect produced by short pulse laser irradiation. As a result, the non-normal phenomenon is defined as pan-Fourier effect. It is caused by wave behavior such as reflection and overlap when heat transfers to boundary of the specimen.