基于分数阶热传导方程激光加热瞬态温度场研究  

Study on the Transient Temperature Field Based on the Fractional Heat Conduction Equation for Laser Heating

作　　者：许光映[1] 王晋宝[1] 韩志[1] 

机构地区：[1]浙江海洋学院海运与港航建筑工程学院,浙江舟山316022

出　　处：《应用数学和力学》2015年第8期844-854,共11页Applied Mathematics and Mechanics

摘　　要：基于分数阶Taylor(泰勒)级数展开原理,建立单相延迟一阶分数阶近似方程,获得分数阶热传导方程.针对短脉冲激光加热问题建立分数阶热传导方程组,并运用Laplace(拉普拉斯)变换方法进行求解,给出非Gauss(高斯)时间分布的激光内热源温度场解析解.针对具体算例数值研究温度波传播特性.结果表明热传播速度与分数阶阶次有关,分数阶阶次增加,热传播速度减小,温度变化幅度增加.分数阶方程可以用于描述介于扩散方程和热波方程间的热传输过程,且对热传播机制与分数阶热传导方程中分数阶项的关系做了深入剖析.Based on the fractional Taylor series expansion principle, the lst-order fractional ap- proximate heat conduction constitutive equation was formulated through expansion of the sin- gle-phase lag model. Combined with the energy equation, the fractional heat conduction equa- tions were built for short pulse laser heating, and the Laplace transform was applied to solve the equations and obtain the analytical solution of the volumetric heat source temperature field of the non-Gauss time type. The properties of the temperature wave influenced by the fractional order were investigated based on specific examples. Ttle thermal wave velocity decreases and its amplitude increases with the fractional order. The fractional heat conduction equation is ap- plicable for depicting the intermediate heat conduction process between that of the Fourier dif- fusion equation and that of the thermal wave equation. The correlation between the heat con- duction mechanism and the fractional derivative terms in the fractional heat conduction equation was also fully discussed.

关 键 词：分数阶热传导 激光加热 分数阶微分 分数阶Taylor公式 

分 类 号：O369[理学—流体力学]