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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Thermal ghosts': apparent decay of fixed surfaces caused by heat diffusion
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Thermal ghosts': apparent decay of fixed surfaces caused by heat diffusion

机译：热鬼：由热扩散引起的固定表面的明显衰减

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摘要

The behaviour concerning classical heat diffusion on fixed thermal surfaces, studied by observations, still holds surprises. As soon as convective and radiative processes are negligible within the medium, this is considered to be free from energy sources and sinks. Then, the heat diffusion equation is conveniently solved using standard Fourier methods. Some considerations about the contrast effect suggest that the surface boundary would rather be observed to follow specific area decay dynamics than remaining fixed and static. Here it is shown that the apparent boundary lies on a specific isothermal spatiotemporal curve, which depends on the observing device. This is characterized by a slight, though determinative, difference between its radiance and that of the ambient background. Thereafter, the heat diffusion yields apparent boundary shrinkage with the passing of time. This phenomenon is particularly notable for two reasons: its lifetime and final decay rate depend only on the medium thermal properties, while being independent of the apparent boundary spatiotemporal curve. Thus, the former provides a suitable method for measuring the medium thermal properties via the observational data. The latter strongly reveal a kind of universality of some characteristic properties of the phenomenon, common to all observers.
机译：通过观察研究，关于固定热表面上经典热扩散的行为仍然令人惊讶。一旦介质内的对流和辐射过程可以忽略不计，则认为该过程没有能源和汇。然后，可以使用标准傅立叶方法方便地求解热扩散方程。关于对比效果的一些考虑表明，宁愿观察到表面边界遵循特定的区域衰减动力学，也不能保持固定和静态。在此表明，视在边界位于特定的等温时空曲线上，该曲线取决于观测装置。其特征在于其辐射度与周围背景的辐射度之间有细微（尽管是决定性的）差异。此后，随着时间的流逝，热扩散产生明显的边界收缩。这种现象尤为显着，原因有两个：其寿命和最终衰减率仅取决于介质的热特性，而与视在边界的时空曲线无关。因此，前者提供了一种通过观测数据测量介质热性能的合适方法。后者强烈揭示了这种现象的某些特征性质的普遍性，这是所有观察者所共有的。

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