T T

Thus, the product center temperature can be seen to be an exponential function of time; a semilog plot of the temperature difference [Tr - T] against time would produce a straight line sloping downward having a slope related to the product's thermal diffusivity and can dimensions (Fig. 15). Because the heat penetration rate factor, fh, is the reciprocal slope of the heat penetration curve, it is related to the product's thermal diffusivity and container dimensions. For a finite cylinder, the following relationship can be used to obtain the thermal diffusivity from a heat penetration curve:

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