Critical times in multilayer diffusion. Part 2: Approximate solutions
International Journal of Heat and Mass Transfer(2009)
摘要
Traditional averaging methods for multilayer diffusion give inaccurate approximations of critical time behaviour, such as the heating time of a material. In particular, they fail to capture the importance of layer order. We use a perturbation expansion of an exact solution to find a simple approximate solution which accurately describes the critical time for transport across multiple layers. This approximate solution is then used to find a correction for the averaging method which captures the key critical time behaviour.
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关键词
Diffusion,Multilayer,Critical time,Time lag,Laminates,Composite materials
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