Abstract
A method for measuring thermal diffusivity in one of the layers of a two-layer composite sample has been described. The heat transfer problem of a two-layer sample associated with pulse thermal diffusivity measurements has been analyzed for two cases: exponential and square-wave pulses. According to our measurements, a triangular heat-pulse function approximates reasonably well the output of the Nd-glass laser. In this paper, an expression is derived for the temperature transient at the rear face of two-layer sample being subjected to a triangular heat-pulse input on the front face. The analytical solution of the problem forms the basis of our method of data reduction. This solution has been programmed for computer processing of the data. The method described here has been successfully tested by limited measurements on copper and iron.
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Zhang, X.Z., He, G.H., Wei, Z. et al. Measurement of thermal diffusivity by the flash method for a two-layer composite sample in the case of triangular pulse. Int J Thermophys 7, 803–810 (1986). https://doi.org/10.1007/BF00503837
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DOI: https://doi.org/10.1007/BF00503837