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The role played by physical parameters governing the transport of heat in periodical time-varying phenomena within solids is discussed. Starting with a brief look at the conduction heat transport mechanism, the equations governing heat conduction under static, stationary and non-stationary conditions, and the physical parameters involved, are described. Special emphasis is given to the phenomenon of diffusion of heat in the presence of periodical heat sources and the related (still unknown for the majority of people) thermal effusivity concept.
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E. Marı́n (2007) studied this question.
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