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Periodic Component Analysis in Mesoscopic Heat Conduction and Relaxation

机译:介观热传导和弛豫中的周期性成分分析

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Mesoscopic approach deals with intermediate level of scrutiny that considers temporal fluctuations which is often averaged out in a macroscopic approach without going into the molecular mean free path or microscopic approach. Transient heat conduction cannot be fully described by Fourier representation. The non-Fourier effects or finite speed of heat propagation effect is accounted for by some investigators using the Cattaneo and Vernotte non-Fourier heat conduction equation; q = -k?T/?x - τr ?q/?t (1) A generalized expression to account for the non-Fourier or thermal inertia effects suggested by Sharma (5) as; q = -k?T/?x - τr ?q/?t - τr 2/2! ?2 q/?t2- τr 3/3! ?3 q/?t3 -?. (2) This was obtained by a Taylor series expansion in time domain. Manifestation of higher order terms in the modified Fourier?w law as periodicity in the time domain is considered in this study. When a CWT is maintained at one end of a medium of length L where L is the distance from the isothermal wall beyond which there is no appreciable temperature change from the initial condition during the duration of the study the transient temperature profile is obtained by the method of Laplace transforms.
机译:介观方法处理考虑了时间波动的中间检查级别,该时间波动通常在宏观方法中被平均而不涉及分子平均自由程或微观方法。瞬态热传导不能用傅立叶表示来完全描述。一些研究人员使用Cattaneo和Vernotte非傅里叶热传导方程解释了非傅里叶效应或有限速度的热传播效应。 q = -k?T /?x-τr?q /?t(1)用以解释Sharma(5)建议的非傅立叶或热惯性效应的广义表达式; q = -k?T /?x-τr?q /?t-τr2/2! ?2 q /?t2-τr3/3! ?3 q /?t3-?。 (2)这是通过时域的泰勒级数展开获得的。在这项研究中,考虑了在时域上的周期性中,表现为经修正的傅里叶流定律中的高阶项的表现。当CWT保持在长度为L的介质的一端时,其中L是距等温壁的距离,超过该距离,在研究期间与初始条件相比没有明显的温度变化,通过该方法可以获得瞬态温度曲线的拉普拉斯变换。

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