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Periodic Component Analysis in Mesoscopic Heat Conduction and Relaxation

机译:中镜热传导和弛豫中的周期性分量分析

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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 -?.^s(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:介观方法涉及中间审查,其考虑颞下波动,该波动通常在宏观方法中平均出来,而不进入分子意味着自由路径或微观方法。傅里叶表示不能完全描述瞬态导热。一些研究人员使用Cattaneo和Vernotte非傅立叶热传导方程占了非傅立叶效应或有限速度的热传播效果; q = -k?t / x-τr?q /Δt(1)通过Sharma(5)所示的非傅立叶或热惯性效应的广义表达式。 q = -k?t /?x - τr?q /Δt-τr2/2! ?2 Q /?T2-τr3/3! ?3 Q /ΔT3 - ?。^ S(2)这是通过时域中的泰勒序列扩展而获得的。在本研究中考虑了在修改的傅里叶兄弟W定期中的更高阶术语的表现为时域中的周期性。当CWT保持在长度L介质的一端时,其中L是从等温壁的距离,超过在研究期间没有从初始条件没有明显的温度变化,通过该方法获得瞬态温度曲线拉普拉斯变换。

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