细陶瓷棒的脉冲热流波动传播行为  

The Behavior of Pulse Heat Flux Wave Propagation in a Fine Round Ceramic Bar

作　　者：胡学功[1] 刘登瀛[1] 周定伟[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《应用科学学报》2002年第3期305-308,共4页Journal of Applied Sciences

基　　金：国家重点基础研究发展规划资助项目 (G2 0 0 0 0 2 63 0 5 )

摘　　要：用脉冲激光模拟微小圆柱陶瓷棒的脉冲内热源情形 ,实验研究了脉冲内热源对圆柱陶瓷端面温度场变化施加的影响 .实验发现 ,陶瓷棒端面存在温度波动等非傅里叶导热现象 .并且用存在内热源项的双曲导热控制方程和热量波动传播理论解释并定性地模拟了这种非傅里叶导热过程 ,得到了热流波动传播的实验证据 .实验与理论计算结果表明 ,热弛豫时间τ对微小空间尺度下非均质材料的急速传热过程起着主导作用 .The effect of a volumetric heat source induced by pulse laser heating in the temperature fields of a fine round ceramic bar was investigated experimentally and theoretically. Experimental results show that non Fourier heat conduction phenomena such as temperature waves exist on the end surface of the fine round ceramic bar. Hyperbolic heat conduction equation was used to model the non Fourier heat conduction process and the theory about thermal energy wave propagation was introduced to explain it. The experimental evidence for thermal energy wave propagation was obtained. The paper makes it clear that thermal relaxation time τ is mainly responsible for rapid transient heat transfer processes in heterogeneous materials.

关 键 词：细陶瓷棒 热流波动传播 脉冲激光 非傅里叶导热 热驰豫时间 脉冲内热源 导热规律 

分 类 号：TK124[动力工程及工程热物理—工程热物理]